Specifications

Symptom:
*CHECKING THE POWER AND GROUNDS
POSSIBLE CAUSES
CHECKING THE ENGINE CONTROL RELAY SYSTEM
EC RELAY OUTPUT CIRCUIT
ECM GROUND CIRCUIT(S) OPEN
ECM OUTPUT SHORTED - FUSE 16
ENGINE CONTROL MODULE
ENGINE CONTROL RELAY
ENGINE CONTROL RELAY B+ SUPPLY
ENGINE CONTROL RELAY CONTROL CIRCUIT OPEN
ENGINE CONTROL RELAY CONTROL CIRCUIT SHORT TO VOLTAGE
ENGINE CONTROL RELAY OUTPUT CIRCUIT(S) OPEN
ENGINE CONTROL RELAY OUTPUT CKT SHORTED TO GROUND FUSE #16
ENGINE CONTROL RELAY OUTPUT CKT SHORTED TO GROUND FUSE #17
IGNITION SWITCH START OUTPUT CIRCUIT OPEN
IGNITION SWITCH START/RUN OUTPUT CIRCUIT OPEN
SHORTED COMPONENT
TEST ACTION APPLICABILITY
1 Turn the ignition off.
Disconnect the ECM harness connectors.
Using a 12-volt test light connected to 12-volts, check each of the ECM ground
circuits in ECM harness connector C2 cavities 2, 4 and 6.
Did the test light illuminate brightly for each cavity?
All
Yes → Go To 2
No → Repair the ECM Ground circuit(s) for an open.
Perform ROAD TEST VERIFICATION - VER-2.
2 Turn the ignition off.
Disconnect the ECM harness connectors.
Turn the ignition switch to the Start position.
Using a 12-volt test light connected to ground, check the Fused Ignition Switch Start
Output circuit in ECM C2 harness connector cavity 36.
Does the test light illuminate brightly?
All
Yes → Go To 3
No → Repair the Ignition Switch Start Output circuit for an open.
Perform ROAD TEST VERIFICATION - VER-2.
235
DRIVEABILITY - DIESEL