Troubleshooting

170 RENR2696-01
Troubleshooting Section
g00885751
Illustrat
ion 82
g00863550
Illustration 83
Fuel pum p power supply
A. Turn the keyswitch to the OFF position.
B. Disconnect the P1 ECM connector and the P40
fuel injection pump connector.
C. Measure the resistance from terminal 59 engine
speed/timing sensor at the ECM and to terminal
8 engine speed/timing sensor of the P40 fuel
injection pump connector.
D. The resistance should be less than 2 ohms.
Expected
Result:
The readings agree with the values that are listed
above.
Results:
•
OK – The ECM does not operate properly.
Repair: P
erform the following repairs on the
suspect ECM.
1. Temporar
ily install a test ECM.
Note: The test ECM should be programmed with the
correct s
oftware. All parameters should be set to the
same value as the suspect ECM.
2. If the fa
ult is eliminated with the test ECM,
reconnect the suspect ECM.
3. If the fa
ult returns with the suspect ECM, then
the suspect ECM is faulty. Replace the suspect
ECM.
STOP.
•
Not OK – T
he readings are higher than 2 ohms.
ProceedtoTestStep6.