TEST
ACTION
APPLICABILITY
8
Turn the ignition off.
Remove and inspect Fuse #16 from Fuse Block No.1
Is the fuse open?
All
Yes
→ Go To 9
No
→ Go To 11
9
Turn the ignition off.
Disconnect the ECM harness connectors.
Install a good fuse in place of Fuse #16 in Fuse Block No.1
Connect a jumper wire between ground and the Engine Control Relay Control circuit
in ECM C2 harness connector cavity 44.
Remove and inspect Fuse #16 from Fuse Block No.1.
Is the fuse open?
All
Yes
→ Repair the Engine Control Relay Output circuit for a short to
ground.
Perform ROAD TEST VERIFICATION - VER-2.
No
→ Go To 10
10
The Fuel Injectors, Crankcase Heater, Water In Fuel Sensor and related circuits can
cause Fuse #16 in Fuse Block No.1 to open. Use the Service Information Wiring
Diagrams and check these circuits/components for shorted circuits.
Were any problems found.
All
Yes
→ Repair or replace shorted circuit/component as necessary.
Perform ROAD TEST VERIFICATION - VER-2.
No
→ Replace and program the ECM in accordance with the Service
Information.
Perform ROAD TEST VERIFICATION - VER-2.
11
Turn the ignition off.
Disconnect the ECM harness connectors.
Connect a jumper wire between ground and the Engine Control Relay Control circuit
in ECM C2 harness connector cavity 44.
Turn the ignition on.
Using a 12-volt test light connected to ground, check the Fused Engine Control Relay
Output circuits at the ECM C2 harness connector cavities 1, 3 and 5.
Choose the appropriate result.
All
Test light is on for all circuits.
Test Complete.
Test light is on for 1 or 2 circuits
Repair the Engine Control Relay Output circuit(s) for an open.
Perform ROAD TEST VERIFICATION - VER-2.
Light off for all circuits.
Go To
12
237
DRIVEABILITY - DIESEL
*CHECKING THE POWER AND GROUNDS —
Continued