help p0708 code
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Joined: Jan 2006
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help p0708 code
i hope i am doing this right - first time.
i need help. i have a '98 f150 showing a p0708 code and cant get it inspected. i have replaced the tr sensor, cleaned the terminals of the connecting plug, adjusted the sensor to line up neutral mark, pulled the whole wiring harness off and checked for wiring damage and cleaned the plug that the harness plugs into behind the main fuses. the code is still coming up after i clear them. it usually comes up when startinh the truck. one more thing - the truck was a flood vehicle. i think i am looking at a pcm but hate to be wrong about it. can anyone help me out. brian
FIXED IT. thanks for everyone who helped - turned out it was in fact the module - the wrong one was in the truck.
i need help. i have a '98 f150 showing a p0708 code and cant get it inspected. i have replaced the tr sensor, cleaned the terminals of the connecting plug, adjusted the sensor to line up neutral mark, pulled the whole wiring harness off and checked for wiring damage and cleaned the plug that the harness plugs into behind the main fuses. the code is still coming up after i clear them. it usually comes up when startinh the truck. one more thing - the truck was a flood vehicle. i think i am looking at a pcm but hate to be wrong about it. can anyone help me out. brian
FIXED IT. thanks for everyone who helped - turned out it was in fact the module - the wrong one was in the truck.
Last edited by brainsm; Mar 6, 2006 at 03:04 PM.
Senior Member
Joined: Jul 2004
Posts: 6,200
Likes: 39
From: Easton, Pa.
The PCM checks for open and short, codes 707/708.
Since you have replaced the sensor and found no imediate wire fault below the the cab, it looks like it may be toward the PCM.
If you had wire info to open the lead near the PCM and see if the code changes to 707 (after clearing code for retest) then it would pin it down pretty well that it is not the PCM.
Try pin 29 at the PCM.
If the code changes, meter for a cross or run a new lead to the matching color code at the sensor end.
Ya gotta do what ya gotta do.
Good luck.
Since you have replaced the sensor and found no imediate wire fault below the the cab, it looks like it may be toward the PCM.
If you had wire info to open the lead near the PCM and see if the code changes to 707 (after clearing code for retest) then it would pin it down pretty well that it is not the PCM.
Try pin 29 at the PCM.
If the code changes, meter for a cross or run a new lead to the matching color code at the sensor end.
Ya gotta do what ya gotta do.
Good luck.