No spark issue
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Joined: Oct 2010
Posts: 10
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I am glad that it's in the ignition system, that makes me more confident that I may be able to find it. I am sure the online community will benifit from an updated schematic.
I will keep plugging at it and if I find a cure I will post it.
I will keep plugging at it and if I find a cure I will post it.
Last edited by Icom2957; Oct 29, 2010 at 12:07 AM.
Senior Member
Joined: Nov 2006
Posts: 5,495
Likes: 7
From: Memphis, TN 38135, USA, Earth
There were subtle changes each year, so I had to include each one.
The next problem is that the Haynes procedure was written for the '85-93 push-start ignition system only; not the later CCD system. They didn't update it, even though they changed the cover to say 80-96.
The next problem is that the Haynes procedure was written for the '85-93 push-start ignition system only; not the later CCD system. They didn't update it, even though they changed the cover to say 80-96.
Originally Posted by Ford
AA1 WERE TESTS IN EEC-IV QUICK TEST COMPLETED
- Were all tests accomplished according to EEC-IV Quick Test procedures?
Yes: GO to AA2.
No: REFER to Section 2A, Diagnostic Routines.
AA2 CHECK FOR GOOD BATTERY
- Is battery voltage greater than 12 volts DC with the key on?
Yes: GO to AA3.
No: SERVICE battery.
AA3 CHECK FOR SPARK AT COIL DURING CRANK
- Using an Air Gap Spark Tester or a Neon Bulb Spark Tester or equivalent, check for spark during crank at coil wire.
- Was spark present during crank?
Yes: GO to AA9.
No: GO to AA4.
AA4 CHECK FOR TFI POWER
- Key off.
- Connect TFI diagnostic harness to EEC breakout box, connect BAT- lead to negative post of battery, and connect TFI module tee to TFI module and vehicle harness.
- Do not connect BAT+ lead of TFI diagnostic harness to battery.
CAUTION: Do not connect EEC processor to EEC breakout box when it is used with TFI diagnostic harness.
- Make sure PIP OPEN/NORMAL/SPOUT OPEN switch on TFI diagnostic harness is in the NORMAL position.
- Use TFI overlay on breakout box.
- DVOM on 20 volt DC scale.
- Key on.
- Measure voltage between J5 (TFI PWR) and J7 (BAT-) at breakout box.
- Is voltage greater than 10 volts DC?
Yes: GO to AA5.
No: SERVICE power open to TFI module in harness or connector. REMOVE all test equipment. RECONNECT all components. CLEAR Continuous Memory. RERUN Quick Test.
AA5 CHECK FOR PIP SIGNAL
- DVOM on 20 volt AC scale.
- Crank engine and measure voltage between J15 (PIP) and J7 (BAT-).
- Is voltage between 3.0 and 8.5 volts AC?
Yes: GO to AA6.
No: GO to AA11.
AA6 CHECK FOR SPOUT SIGNAL
- Crank engine and measure voltage between J10 (SPOUT) and J7 (BAT-).
- Is voltage between 3.0 and 8.5 volts AC?
Yes: GO to AA7.
No: GO to AA18.
AA7 CHECK VBAT AT COIL
- Key off.
- Connect diagnostic harness coil tee to vehicle harness; do not connect diagnostic harness to coil.
- Key on.
- DVOM on 20 volt DC scale.
- Measure voltage between J2 (VBAT C) and J7 (BAT-).
- Is voltage greater than 10 volts DC?
Yes: GO to AA8.
No: SERVICE power open to coil in harness or connector. REMOVE all test equipment. RECONNECT all components. CLEAR Continuous Memory. RERUN Quick Test.
AA8 CHECK FOR COIL SIGNAL
- Key off.
- Connect BAT+ lead of TFI diagnostic harness to positive post of battery.
- Connect 12 volt incandescent test lamp between J1 (BAT+) and J3 (COIL-).
- Key on.
- Crank engine.
- Did test lamp flash brightly?
Yes: REPLACE coil. REMOVE all test equipment. RECONNECT all components. CLEAR Continuous Memory. RERUN Quick Test.
No: GO to AA27.
AA9 CHECK FOR SPARK AT ALL WIRES
- Using an Air Gap Spark Tester or Neon Bulb Spark Tester or equivalent, check for spark at all wires.
- Was spark present at all plugs during crank?
Yes: GO to AA10.
No: SERVICE distributor cap, rotor, plugs or plug wires. REMOVE all test equipment. RECONNECT all components. CLEAR Continuous Memory. RERUN Quick Test.
AA10 CHECK PLUGS
- Remove and check plugs for damage, wear, carbon deposits and proper plug gap.
- Are plugs OK?
Yes: Not an Ignition problem, REFER to Section 2A Diagnostic Routines.
No: SERVICE plugs. REMOVE all test equipment. RECONNECT all components. CLEAR Continuous Memory. RERUN Quick Test.
AA11 CHECK FOR PIP POWER AT PIP SENSOR
- Connect diagnostic harness PIP sensor tee to PIP sensor and vehicle harness.
- DVOM on 20 volt DC scale.
- Key on.
- Measure voltage between: J22 (PIP PWR) and J7 (BAT-) if 8 pin PIP sensor connector or J27 (PIP PWR) and J7 (BAT-) if 4 pin PIP sensor connector.
- Is voltage greater than 10 volts DC?
Yes: GO to AA12.
No: SERVICE power to PIP sensor in harness or connector. REMOVE all test equipment. RECONNECT all components. CLEAR Continuous Memory. RERUN Quick Test.
AA12 CHECK FOR PIP FROM PIP SENSOR
- Turn switch on diagnostic cable to PIP OPEN.
- DVOM on 20 volt AC scale.
- Crank engine and measure voltage between: J34 (PIP A) and J7 (BAT-) if 8 pin PIP sensor connector or J13 (PIP) and J7 (BAT-) if 4 pin PIP sensor connector.
- Is voltage between 3.0 and 8.5 volts AC?
Yes: GO to AA13.
No: CHECK PIP sensor wiring. If OK, REPLACE PIP sensor. REMOVE all test equipment. RECONNECT all components. CLEAR Continuous Memory. RERUN Quick Test.
AA13 CHECK PIP WITH TFI DISCONNECTED
- Key off.
- Turn switch on diagnostic cable to NORMAL.
- Disconnect diagnostic harness TFI module tee from TFI module only; leave TFI module tee connected to vehicle harness.
- Crank engine and measure voltage between: J34 (PIP A) and J7 (BAT-) if 8 pin PIP sensor connector or J13 (PIP) and J7 (BAT-) if 4 pin PIP sensor connector.
- Is voltage between 3.0 and 8.5 volts AC?
Yes: REPLACE TFI module. REMOVE all test equipment. RECONNECT all components. CLEAR Continuous Memory. RERUN Quick Test.
No: GO to AA14.
AA14 CHECK PIP WITH EEC PROCESSOR DISCONNECTED
- Disconnect EEC processor.
- Crank engine and measure voltage between: J34 (PIP A) and J7 (BAT-) if 8 pin PIP sensor connector or J13 (PIP) and J7 (BAT-) if 4 pin PIP sensor connector.
- Is voltage between 3.0 and 8.5 volts AC?
Yes: REPLACE EEC processor. REMOVE all test equipment. RECONNECT all components. CLEAR Continuous Memory. RERUN Quick Test.
No: GO to AA15.
AA15 CHECK PIP A TO EEC PROCESSOR FOR SHORT HIGH
- Key off.
- Disconnect diagnostic harness PIP sensor tee from PIP sensor only; leave PIP sensor tee connected to vehicle harness.
- DVOM on 20 volt DC scale.
- Key on.
- Measure voltage between: J34 (PIP A) and J7 (BAT-) if 8 pin PIP sensor connector or J13 (PIP) and J7 (BAT-) if 4 pin PIP sensor connector- Is voltage less than 0.5 volt DC?
Yes: For Systems B and F:
GO to AA16.
For all other Systems:
SERVICE PIP between PIP sensor and EEC processor or TFI module in harness for short low. REMOVE all test equipment. RECONNECT all components. CLEAR Continuous Memory. RERUN Quick Test.
No: For Systems B and F:
SERVICE PIP A between PIP sensor and EEC processor in harness for short high. REMOVE all test equipment. RECONNECT all components. CLEAR Continuous Memory. RERUN Quick Test.
For all other Systems:
SERVICE PIP between PIP sensor and EEC processor or TFI module in harness for short high. REMOVE all test equipment. RECONNECT all components. CLEAR Continuous Memory. RERUN Quick Test.
AA16 CHECK PIP B TO TFI FOR SHORT HIGH
- Key on.
- Measure voltage between J41 (PIP B) and J7 (BAT-).
- Is the voltage less than 0.5 volt DC?
Yes: GO to AA17.
No: SERVICE PIP B between PIP sensor and TFI module in harness for short high. REMOVE all test equipment. RECONNECT all components. CLEAR Continuous Memory. RERUN Quick Test.
AA17 CHECK PIP IN HARNESS FOR SHORT LOW
- Key off.
- DVOM on 20K ohm scale.
- Measure resistance between J41 (PIP B) and J7 (BAT-).
- Is resistance greater than 10K ohms?
Yes: SERVICE PIP A between PIP sensor and EEC processor in harness for short low. REMOVE all test equipment. RECONNECT all components. CLEAR Continuous Memory. RERUN Quick Test.
No: SERVICE PIP B between PIP sensor and TFI module in harness for short low. REMOVE all test equipment. RECONNECT all components. CLEAR Continuous Memory. RERUN Quick Test.
AA18 CHECK FOR SPOUT IN HARNESS
- Turn switch to SPOUT OPEN position on diagnostic harness.
- Crank engine and measure voltage between J10 (SPOUT) and J7 (BAT-).
- Is voltage between 3.0 and 8.5 volts AC?
NOTE: Engine may start; continue diagnostics.
Yes: REPLACE TFI module. REMOVE all test equipment. RECONNECT all components. CLEAR Continuous Memory. RERUN Quick Test.
No: GO to AA19.
AA19 CHECK FOR SPOUT HIGH
- Key off.
- Disconnect diagnostic harness TFI module tee from TFI module only; leave TFI module tee connected to vehicle harness.
- Turn switch to NORMAL on diagnostic harness.
- DVOM on 20 volt DC scale.
- Measure voltage between J10 (SPOUT) and J7 (BAT-), with key on.
- Is voltage less than 0.5 volt DC?
Yes: GO to AA21.
No: GO to AA20.
AA20 CHECK FOR SPOUT SHORT HIGH IN HARNESS
- Key off.
- Disconnect EEC processor.
- Measure voltage between J10 (SPOUT) and J7 (BAT-) with key on.
- Is voltage less than 0.5 volt DC?
Yes: GO to AA23.
No: SERVICE SPOUT between EEC processor and TFI module in harness for short high. REMOVE all test equipment. RECONNECT all components. CLEAR Continuous Memory. RERUN Quick Test.
AA21 CHECK FOR SPOUT SHORT LOW
- Key off.
- DVOM on 20K ohm scale.
- Measure resistance between J10 (SPOUT) and J7 (BAT-).
- Is resistance greater than 10K ohms?
Yes: GO to AA23.
No: GO to AA22.
AA22 CHECK FOR SPOUT SHORT LOW IN HARNESS
- Disconnect EEC processor.
- Measure resistance between J10 (SPOUT) and J7 (BAT-).
- Is resistance greater than 10K ohms?
Yes: GO to AA23.
No: SERVICE SPOUT between EEC processor and TFI module in harness for short low. REMOVE all test equipment. RECONNECT all components. CLEAR Continuous Memory. RERUN Quick Test.
AA23 CHECK FOR PIP OPEN IN HARNESS
- Key off.
- DVOM on 20 volt AC scale.
- Disconnect EEC processor.
- Crank engine and measure voltage between Pin 56 (PIP) of EEC processor harness connector and J7 (BAT-).
- Is voltage between 3.0 and 8.5 volts AC?
Yes: GO to AA24.
No: GO to AA26.
AA24 CHECK IGN GND AT EEC PROCESSOR
- Key off.
- Reconnect diagnostic harness TFI module tee to TFI module.
- DVOM on 200 ohm scale.
- Measure resistance between Pin 16 (IGN GND) of EEC processor harness connector and J7 (BAT-) at the breakout box.
- Is resistance less than 5.0 ohms?
Yes: REPLACE EEC processor. REMOVE all test equipment. RECONNECT all components. CLEAR Continuous Memory. RERUN Quick Test.
No: GO to AA25.
AA25 CHECK FOR IGN GND AT PIP SENSOR
- Connect diagnostic harness PIP sensor tee to PIP sensor and vehicle harness.
- Measure resistance between: J35 (IGN GND) and J7 (BAT-) if 8 pin PIP sensor connector or J19 (IGN GND) and J7 (BAT-) if 4 pin PIP sensor connector.
- Is resistance less than 5.0 ohms?
Yes: SERVICE IGN GND between EEC processor and PIP sensor in harness for open. REMOVE all test equipment. RECONNECT all components. CLEAR Continuous Memory. RERUN Quick Test.
No: SERVICE IGN GND wire or REPLACE PIP sensor. IGN GND open in PIP sensor. REMOVE all test equipment. RECONNECT all components. CLEAR Continuous Memory. RERUN Quick Test.
AA26 CHECK PIP A AT PIP SENSOR
- Turn switch from NORMAL to PIP OPEN position.
- Connect diagnostic harness PIP sensor tee to PIP sensor and vehicle harness.
- Crank engine and measure voltage between: J34 (PIP A) and J7 (BAT-) if 8 pin PIP sensor connector or J13 (PIP) and J7 (BAT-) if 4 pin PIP sensor connector.
- Is voltage between 3.0 and 8.5 volts AC?
Yes: SERVICE PIP open in harness between EEC module and PIP sensor. REMOVE all test equipment. RECONNECT all components. CLEAR Continuous Memory. RERUN Quick Test.
No: SERVICE PIP wire or REPLACE PIP sensor. PIP open in PIP sensor. REMOVE all test equipment. RECONNECT all components. CLEAR Continuous Memory. RERUN Quick Test.
AA27 CHECK FOR COIL- OPEN IN HARNESS
- Key off.
- Disconnect diagnostic harness TFI module tee from TFI module only; leave TFI module tee connected to vehicle harness.
- Disconnect BAT+ lead of TFI diagnostic harness from battery.
- DVOM on 200 ohm scale.
- Measure the resistance between J3 (COIL-) and J4 (TFI COIL-).
- Is resistance less than 5.0 ohms?
Yes: GO to AA28.
No: SERVICE open coil- between TFI module and coil in harness. REMOVE all test equipment. RECONNECT all components. CLEAR Continuous Memory. RERUN Quick Test.
AA28 CHECK FOR COIL- SHORT LOW IN HARNESS
- Key off.
- DVOM on 20K ohm scale.
- Measure resistance between J3 (COIL-) and J7 (BAT-).
- Is resistance greater than 10K ohms?
Yes: GO to AA29.
No: SERVICE coil - short low in harness between coil and TFI module. Coil may be damaged. REMOVE all test equipment. RECONNECT all components. CLEAR Continuous Memory. RERUN Quick Test.
AA29 CHECK FOR COIL- SHORT HIGH IN HARNESS
- DVOM on 20 volt DC scale.
- Key on.
- Measure voltage between J3 (COIL-) and J7 (BAT-).
- Is voltage less than 5.5 volts DC?
Yes: GO to AA30.
No: SERVICE coil - short high in harness between coil and TFI module. REMOVE all test equipment. RECONNECT all components. CLEAR Continuous Memory. RERUN Quick Test.
AA30 CHECK GND AT TFI MODULE
- Key off.
- DVOM on 200 ohm scale.
- Measure resistance between J9 (GND) and J7 (BAT-).
- Is resistance less than 5.0 ohms?
Yes: REPLACE TFI module. REMOVE all test equipment. RECONNECT all components. CLEAR Continuous Memory. RERUN Quick Test.
No: GO to AA31.
AA31 CHECK GND AT PIP SENSOR
- Connect diagnostic harness PIP sensor tee to the PIP sensor and vehicle harness.
- Measure resistance between: J28 (GND) and J7 (BAT-) if 8 pin PIP sensor connector or J26 (GND) and J7 (BAT-) if 4 pin PIP sensor connector.
- Is resistance less than 5.0 ohms?
Yes: SERVICE open GND in harness between PIP sensor and TFI module. REMOVE all test equipment. RECONNECT all components. CLEAR Continuous Memory. RERUN Quick Test.
No: GND open in PIP sensor or connector. SERVICE GND wire or REPLACE sensor. REMOVE all test equipment. RECONNECT all components. CLEAR Continuous Memory. RERUN Quick Test.
- Were all tests accomplished according to EEC-IV Quick Test procedures?
Yes: GO to AA2.
No: REFER to Section 2A, Diagnostic Routines.
AA2 CHECK FOR GOOD BATTERY
- Is battery voltage greater than 12 volts DC with the key on?
Yes: GO to AA3.
No: SERVICE battery.
AA3 CHECK FOR SPARK AT COIL DURING CRANK
- Using an Air Gap Spark Tester or a Neon Bulb Spark Tester or equivalent, check for spark during crank at coil wire.
- Was spark present during crank?
Yes: GO to AA9.
No: GO to AA4.
AA4 CHECK FOR TFI POWER
- Key off.
- Connect TFI diagnostic harness to EEC breakout box, connect BAT- lead to negative post of battery, and connect TFI module tee to TFI module and vehicle harness.
- Do not connect BAT+ lead of TFI diagnostic harness to battery.
CAUTION: Do not connect EEC processor to EEC breakout box when it is used with TFI diagnostic harness.
- Make sure PIP OPEN/NORMAL/SPOUT OPEN switch on TFI diagnostic harness is in the NORMAL position.
- Use TFI overlay on breakout box.
- DVOM on 20 volt DC scale.
- Key on.
- Measure voltage between J5 (TFI PWR) and J7 (BAT-) at breakout box.
- Is voltage greater than 10 volts DC?
Yes: GO to AA5.
No: SERVICE power open to TFI module in harness or connector. REMOVE all test equipment. RECONNECT all components. CLEAR Continuous Memory. RERUN Quick Test.
AA5 CHECK FOR PIP SIGNAL
- DVOM on 20 volt AC scale.
- Crank engine and measure voltage between J15 (PIP) and J7 (BAT-).
- Is voltage between 3.0 and 8.5 volts AC?
Yes: GO to AA6.
No: GO to AA11.
AA6 CHECK FOR SPOUT SIGNAL
- Crank engine and measure voltage between J10 (SPOUT) and J7 (BAT-).
- Is voltage between 3.0 and 8.5 volts AC?
Yes: GO to AA7.
No: GO to AA18.
AA7 CHECK VBAT AT COIL
- Key off.
- Connect diagnostic harness coil tee to vehicle harness; do not connect diagnostic harness to coil.
- Key on.
- DVOM on 20 volt DC scale.
- Measure voltage between J2 (VBAT C) and J7 (BAT-).
- Is voltage greater than 10 volts DC?
Yes: GO to AA8.
No: SERVICE power open to coil in harness or connector. REMOVE all test equipment. RECONNECT all components. CLEAR Continuous Memory. RERUN Quick Test.
AA8 CHECK FOR COIL SIGNAL
- Key off.
- Connect BAT+ lead of TFI diagnostic harness to positive post of battery.
- Connect 12 volt incandescent test lamp between J1 (BAT+) and J3 (COIL-).
- Key on.
- Crank engine.
- Did test lamp flash brightly?
Yes: REPLACE coil. REMOVE all test equipment. RECONNECT all components. CLEAR Continuous Memory. RERUN Quick Test.
No: GO to AA27.
AA9 CHECK FOR SPARK AT ALL WIRES
- Using an Air Gap Spark Tester or Neon Bulb Spark Tester or equivalent, check for spark at all wires.
- Was spark present at all plugs during crank?
Yes: GO to AA10.
No: SERVICE distributor cap, rotor, plugs or plug wires. REMOVE all test equipment. RECONNECT all components. CLEAR Continuous Memory. RERUN Quick Test.
AA10 CHECK PLUGS
- Remove and check plugs for damage, wear, carbon deposits and proper plug gap.
- Are plugs OK?
Yes: Not an Ignition problem, REFER to Section 2A Diagnostic Routines.
No: SERVICE plugs. REMOVE all test equipment. RECONNECT all components. CLEAR Continuous Memory. RERUN Quick Test.
AA11 CHECK FOR PIP POWER AT PIP SENSOR
- Connect diagnostic harness PIP sensor tee to PIP sensor and vehicle harness.
- DVOM on 20 volt DC scale.
- Key on.
- Measure voltage between: J22 (PIP PWR) and J7 (BAT-) if 8 pin PIP sensor connector or J27 (PIP PWR) and J7 (BAT-) if 4 pin PIP sensor connector.
- Is voltage greater than 10 volts DC?
Yes: GO to AA12.
No: SERVICE power to PIP sensor in harness or connector. REMOVE all test equipment. RECONNECT all components. CLEAR Continuous Memory. RERUN Quick Test.
AA12 CHECK FOR PIP FROM PIP SENSOR
- Turn switch on diagnostic cable to PIP OPEN.
- DVOM on 20 volt AC scale.
- Crank engine and measure voltage between: J34 (PIP A) and J7 (BAT-) if 8 pin PIP sensor connector or J13 (PIP) and J7 (BAT-) if 4 pin PIP sensor connector.
- Is voltage between 3.0 and 8.5 volts AC?
Yes: GO to AA13.
No: CHECK PIP sensor wiring. If OK, REPLACE PIP sensor. REMOVE all test equipment. RECONNECT all components. CLEAR Continuous Memory. RERUN Quick Test.
AA13 CHECK PIP WITH TFI DISCONNECTED
- Key off.
- Turn switch on diagnostic cable to NORMAL.
- Disconnect diagnostic harness TFI module tee from TFI module only; leave TFI module tee connected to vehicle harness.
- Crank engine and measure voltage between: J34 (PIP A) and J7 (BAT-) if 8 pin PIP sensor connector or J13 (PIP) and J7 (BAT-) if 4 pin PIP sensor connector.
- Is voltage between 3.0 and 8.5 volts AC?
Yes: REPLACE TFI module. REMOVE all test equipment. RECONNECT all components. CLEAR Continuous Memory. RERUN Quick Test.
No: GO to AA14.
AA14 CHECK PIP WITH EEC PROCESSOR DISCONNECTED
- Disconnect EEC processor.
- Crank engine and measure voltage between: J34 (PIP A) and J7 (BAT-) if 8 pin PIP sensor connector or J13 (PIP) and J7 (BAT-) if 4 pin PIP sensor connector.
- Is voltage between 3.0 and 8.5 volts AC?
Yes: REPLACE EEC processor. REMOVE all test equipment. RECONNECT all components. CLEAR Continuous Memory. RERUN Quick Test.
No: GO to AA15.
AA15 CHECK PIP A TO EEC PROCESSOR FOR SHORT HIGH
- Key off.
- Disconnect diagnostic harness PIP sensor tee from PIP sensor only; leave PIP sensor tee connected to vehicle harness.
- DVOM on 20 volt DC scale.
- Key on.
- Measure voltage between: J34 (PIP A) and J7 (BAT-) if 8 pin PIP sensor connector or J13 (PIP) and J7 (BAT-) if 4 pin PIP sensor connector- Is voltage less than 0.5 volt DC?
Yes: For Systems B and F:
GO to AA16.
For all other Systems:
SERVICE PIP between PIP sensor and EEC processor or TFI module in harness for short low. REMOVE all test equipment. RECONNECT all components. CLEAR Continuous Memory. RERUN Quick Test.
No: For Systems B and F:
SERVICE PIP A between PIP sensor and EEC processor in harness for short high. REMOVE all test equipment. RECONNECT all components. CLEAR Continuous Memory. RERUN Quick Test.
For all other Systems:
SERVICE PIP between PIP sensor and EEC processor or TFI module in harness for short high. REMOVE all test equipment. RECONNECT all components. CLEAR Continuous Memory. RERUN Quick Test.
AA16 CHECK PIP B TO TFI FOR SHORT HIGH
- Key on.
- Measure voltage between J41 (PIP B) and J7 (BAT-).
- Is the voltage less than 0.5 volt DC?
Yes: GO to AA17.
No: SERVICE PIP B between PIP sensor and TFI module in harness for short high. REMOVE all test equipment. RECONNECT all components. CLEAR Continuous Memory. RERUN Quick Test.
AA17 CHECK PIP IN HARNESS FOR SHORT LOW
- Key off.
- DVOM on 20K ohm scale.
- Measure resistance between J41 (PIP B) and J7 (BAT-).
- Is resistance greater than 10K ohms?
Yes: SERVICE PIP A between PIP sensor and EEC processor in harness for short low. REMOVE all test equipment. RECONNECT all components. CLEAR Continuous Memory. RERUN Quick Test.
No: SERVICE PIP B between PIP sensor and TFI module in harness for short low. REMOVE all test equipment. RECONNECT all components. CLEAR Continuous Memory. RERUN Quick Test.
AA18 CHECK FOR SPOUT IN HARNESS
- Turn switch to SPOUT OPEN position on diagnostic harness.
- Crank engine and measure voltage between J10 (SPOUT) and J7 (BAT-).
- Is voltage between 3.0 and 8.5 volts AC?
NOTE: Engine may start; continue diagnostics.
Yes: REPLACE TFI module. REMOVE all test equipment. RECONNECT all components. CLEAR Continuous Memory. RERUN Quick Test.
No: GO to AA19.
AA19 CHECK FOR SPOUT HIGH
- Key off.
- Disconnect diagnostic harness TFI module tee from TFI module only; leave TFI module tee connected to vehicle harness.
- Turn switch to NORMAL on diagnostic harness.
- DVOM on 20 volt DC scale.
- Measure voltage between J10 (SPOUT) and J7 (BAT-), with key on.
- Is voltage less than 0.5 volt DC?
Yes: GO to AA21.
No: GO to AA20.
AA20 CHECK FOR SPOUT SHORT HIGH IN HARNESS
- Key off.
- Disconnect EEC processor.
- Measure voltage between J10 (SPOUT) and J7 (BAT-) with key on.
- Is voltage less than 0.5 volt DC?
Yes: GO to AA23.
No: SERVICE SPOUT between EEC processor and TFI module in harness for short high. REMOVE all test equipment. RECONNECT all components. CLEAR Continuous Memory. RERUN Quick Test.
AA21 CHECK FOR SPOUT SHORT LOW
- Key off.
- DVOM on 20K ohm scale.
- Measure resistance between J10 (SPOUT) and J7 (BAT-).
- Is resistance greater than 10K ohms?
Yes: GO to AA23.
No: GO to AA22.
AA22 CHECK FOR SPOUT SHORT LOW IN HARNESS
- Disconnect EEC processor.
- Measure resistance between J10 (SPOUT) and J7 (BAT-).
- Is resistance greater than 10K ohms?
Yes: GO to AA23.
No: SERVICE SPOUT between EEC processor and TFI module in harness for short low. REMOVE all test equipment. RECONNECT all components. CLEAR Continuous Memory. RERUN Quick Test.
AA23 CHECK FOR PIP OPEN IN HARNESS
- Key off.
- DVOM on 20 volt AC scale.
- Disconnect EEC processor.
- Crank engine and measure voltage between Pin 56 (PIP) of EEC processor harness connector and J7 (BAT-).
- Is voltage between 3.0 and 8.5 volts AC?
Yes: GO to AA24.
No: GO to AA26.
AA24 CHECK IGN GND AT EEC PROCESSOR
- Key off.
- Reconnect diagnostic harness TFI module tee to TFI module.
- DVOM on 200 ohm scale.
- Measure resistance between Pin 16 (IGN GND) of EEC processor harness connector and J7 (BAT-) at the breakout box.
- Is resistance less than 5.0 ohms?
Yes: REPLACE EEC processor. REMOVE all test equipment. RECONNECT all components. CLEAR Continuous Memory. RERUN Quick Test.
No: GO to AA25.
AA25 CHECK FOR IGN GND AT PIP SENSOR
- Connect diagnostic harness PIP sensor tee to PIP sensor and vehicle harness.
- Measure resistance between: J35 (IGN GND) and J7 (BAT-) if 8 pin PIP sensor connector or J19 (IGN GND) and J7 (BAT-) if 4 pin PIP sensor connector.
- Is resistance less than 5.0 ohms?
Yes: SERVICE IGN GND between EEC processor and PIP sensor in harness for open. REMOVE all test equipment. RECONNECT all components. CLEAR Continuous Memory. RERUN Quick Test.
No: SERVICE IGN GND wire or REPLACE PIP sensor. IGN GND open in PIP sensor. REMOVE all test equipment. RECONNECT all components. CLEAR Continuous Memory. RERUN Quick Test.
AA26 CHECK PIP A AT PIP SENSOR
- Turn switch from NORMAL to PIP OPEN position.
- Connect diagnostic harness PIP sensor tee to PIP sensor and vehicle harness.
- Crank engine and measure voltage between: J34 (PIP A) and J7 (BAT-) if 8 pin PIP sensor connector or J13 (PIP) and J7 (BAT-) if 4 pin PIP sensor connector.
- Is voltage between 3.0 and 8.5 volts AC?
Yes: SERVICE PIP open in harness between EEC module and PIP sensor. REMOVE all test equipment. RECONNECT all components. CLEAR Continuous Memory. RERUN Quick Test.
No: SERVICE PIP wire or REPLACE PIP sensor. PIP open in PIP sensor. REMOVE all test equipment. RECONNECT all components. CLEAR Continuous Memory. RERUN Quick Test.
AA27 CHECK FOR COIL- OPEN IN HARNESS
- Key off.
- Disconnect diagnostic harness TFI module tee from TFI module only; leave TFI module tee connected to vehicle harness.
- Disconnect BAT+ lead of TFI diagnostic harness from battery.
- DVOM on 200 ohm scale.
- Measure the resistance between J3 (COIL-) and J4 (TFI COIL-).
- Is resistance less than 5.0 ohms?
Yes: GO to AA28.
No: SERVICE open coil- between TFI module and coil in harness. REMOVE all test equipment. RECONNECT all components. CLEAR Continuous Memory. RERUN Quick Test.
AA28 CHECK FOR COIL- SHORT LOW IN HARNESS
- Key off.
- DVOM on 20K ohm scale.
- Measure resistance between J3 (COIL-) and J7 (BAT-).
- Is resistance greater than 10K ohms?
Yes: GO to AA29.
No: SERVICE coil - short low in harness between coil and TFI module. Coil may be damaged. REMOVE all test equipment. RECONNECT all components. CLEAR Continuous Memory. RERUN Quick Test.
AA29 CHECK FOR COIL- SHORT HIGH IN HARNESS
- DVOM on 20 volt DC scale.
- Key on.
- Measure voltage between J3 (COIL-) and J7 (BAT-).
- Is voltage less than 5.5 volts DC?
Yes: GO to AA30.
No: SERVICE coil - short high in harness between coil and TFI module. REMOVE all test equipment. RECONNECT all components. CLEAR Continuous Memory. RERUN Quick Test.
AA30 CHECK GND AT TFI MODULE
- Key off.
- DVOM on 200 ohm scale.
- Measure resistance between J9 (GND) and J7 (BAT-).
- Is resistance less than 5.0 ohms?
Yes: REPLACE TFI module. REMOVE all test equipment. RECONNECT all components. CLEAR Continuous Memory. RERUN Quick Test.
No: GO to AA31.
AA31 CHECK GND AT PIP SENSOR
- Connect diagnostic harness PIP sensor tee to the PIP sensor and vehicle harness.
- Measure resistance between: J28 (GND) and J7 (BAT-) if 8 pin PIP sensor connector or J26 (GND) and J7 (BAT-) if 4 pin PIP sensor connector.
- Is resistance less than 5.0 ohms?
Yes: SERVICE open GND in harness between PIP sensor and TFI module. REMOVE all test equipment. RECONNECT all components. CLEAR Continuous Memory. RERUN Quick Test.
No: GND open in PIP sensor or connector. SERVICE GND wire or REPLACE sensor. REMOVE all test equipment. RECONNECT all components. CLEAR Continuous Memory. RERUN Quick Test.
Last edited by Steve83; Oct 31, 2010 at 03:09 AM.