2004 excursion
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5th Wheeling
Joined: Oct 2016
Posts: 31
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From: va
2004 excursion
started out with lose of rps. then she stalled out and after 20 min or so started right back up and got her home. tried to put snap on computer on her to see what was going on and had no communication tried a friends comp and same thing checked all fuses and made sure key was on still nothing. now she has no fuel gauge at all and we know shes at about ahalf tank. she still wont start and still chasing my tail. Please any help would be nice.
Fleet Owner
Joined: Nov 2003
Posts: 27,924
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Be careful when probing pins on the Data Link Connector.
Note - The top row of pins begin with #1 from the left, and end with #8 on the right. The bottom row begin with #9 from the left, and end with #16 on the right.
Verify that you have B+ (battery voltage) to pin #16 of the DLC (Data Link Connector - OBDII port). This terminal should be powered at ALL times.
Also verify that the cigar lighter doesn't work.
Verify ground at body ground pin #4 and sensor ground pin #5 also.
Check resistance between pins 6 and 14 on the DLC with the key off. Should be 0, 60, or 120 ohms. Everything is OK if it is 60 ohms.
Pins 6 and 14 are the CAN bus (+) and (-). Pin 6 is the CAN serial data high line
Verify 5 volts at pin #10.
Also Verify 3.5 volts at pin #7 (ISO bus).
Check for v-reference short by unplugging the two wire sensors and testing:
EOT, ECT, IAT1 (MAT at the MAF, IAT2, TFT, WIF sensor. Also the ambient air temp and cab air temp through the HEC).
Check for v-reference short by unplugging the three wire sensors and testing:
Fan speed sensor (in fan clutch connector wiring), APP, EGR valve, ICP, EBP, MAP, BARO, TPS sensors, vehicle speed sensor.
Note - The top row of pins begin with #1 from the left, and end with #8 on the right. The bottom row begin with #9 from the left, and end with #16 on the right.
Verify that you have B+ (battery voltage) to pin #16 of the DLC (Data Link Connector - OBDII port). This terminal should be powered at ALL times.
Also verify that the cigar lighter doesn't work.
Verify ground at body ground pin #4 and sensor ground pin #5 also.
Check resistance between pins 6 and 14 on the DLC with the key off. Should be 0, 60, or 120 ohms. Everything is OK if it is 60 ohms.
Pins 6 and 14 are the CAN bus (+) and (-). Pin 6 is the CAN serial data high line
Verify 5 volts at pin #10.
Also Verify 3.5 volts at pin #7 (ISO bus).
Check for v-reference short by unplugging the two wire sensors and testing:
EOT, ECT, IAT1 (MAT at the MAF, IAT2, TFT, WIF sensor. Also the ambient air temp and cab air temp through the HEC).
Check for v-reference short by unplugging the three wire sensors and testing:
Fan speed sensor (in fan clutch connector wiring), APP, EGR valve, ICP, EBP, MAP, BARO, TPS sensors, vehicle speed sensor.
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tobyw
1987 - 1996 F150 & Larger F-Series Trucks
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Nov 21, 2007 08:17 PM
