TEST
ACTION
APPLICABILITY
3
Turn the ignition off.
Using a 12-volt test light connected to ground, probe the (A930) Fused B+ circuit of
the fuel pump relay in the PDC.
Does the test light illuminate brightly?
All
Yes
→ Go To 4
No
→ Repair the open or short to ground in the (A930) Fused B+ circuit.
Inspect and replace any open fuses.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
4
Measure the resistance of the Fuel Pump Relay Coil.
Is the resistance between 70 to 90 ohms?
All
Yes
→ Go To 5
No
→ Replace the Fuel Pump Relay.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
5
Disconnect the C3 PCM harness connector.
CAUTION: DO NOT PROBE THE PCM HARNESS CONNECTORS. PROBING
THE PCM HARNESS CONNECTORS WILL DAMAGE THE PCM TERMI-
NALS RESULTING IN POOR TERMINAL TO PIN CONNECTION. INSTALL
MILLER SPECIAL TOOL #8815 TO PERFORM DIAGNOSIS.
Measure the resistance of the (K31) Fuel Pump Relay Control circuit from the PDC
to the appropriate terminal of special tool #8815.
Is the resistance below 5.0 ohms?
All
Yes
→ Go To 6
No
→ Repair the open in the (K31) Fuel Pump Relay Control circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
6
Measure the resistance between ground and the (K31) Fuel Pump Relay Control
circuit in the PDC.
Is the resistance below 5.0 ohms?
All
Yes
→ Repair the short to ground in the (K31) Fuel Pump Relay Control
circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No
→ Go To 7
7
NOTE: Before continuing, check the PCM harness connector terminals for
corrosion, damage, or terminal push out. Repair as necessary.
Using the schematics as a guide, inspect the wire harness and connectors. Pay
particular attention to all Power and Ground circuits.
If there are no possible causes remaining, view repair.
All
Repair
Replace and program the Powertrain Control Module per Service
Information.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
233
DRIVEABILITY - NGC
P0627-FUEL PUMP RELAY CIRCUIT —
Continued