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Home >> Isuzu >> 2004 >> Axiom Base, RWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine DRIVEABILITY And Emissions - DTC P1237 To DTC U2104 >> DTC P1250: Fuel Pump Relay Control Circuit Shorted to Ground >> Test Description

Test Description

  1. Refer to HIGH FUEL PRESSURE SYSTEM  section.
DTC P1250 - FUEL PUMP RELAY CONTROL CIRCUIT SHORTED TO GROUND

Step Action Values Yes No
1 Refer to the Knock Sensing System Check .
Was the "On-Board Diagnostic (OBDII) System Check" performed?		 - Go to Step 2 Go to On-Board Diagnostic (OBD-II) System Check
2
  1. Ignition "OFF".
  2. Disconnect the Fuel pump relay.
  3. Disconnect the ECM.
  4. Check the Circuit between the Fuel pump relay and the ECM for the following condition.
    1. A short to ground.
Was a problem found?		 - Go to Step 3 Go to Step 4
3 Replace the circuit as necessary.
Is the action complete?		 - Verify repair -
4
  1. Clear the DTC code.
  2. Recheck the DTC code.
Was the DTC P1250 stored?		 - Go to Step 5 Verify repair
5 Install the test ECM.
Program the test ECM (Immobilizer system). Refer to IMMOBILIZER SYSTEM .
Check the OBD-II test for following condition:
  1. When the ignition is "ON", turn on the MIL and RPL (RPL is put out after 3 seconds).
  2. When the engine is started.

Did the DTC disappear?		 - Go to Step 6 Go to Step 2
6 Replace the original ECM.
Check the poor connection between the ECM and ECM connector.
Recheck the OBD -II test again.
When the engine is started.
Did the DTC disappear?		 - Verify repair Go to Step 7
7 Disconnect the ABS control unit connector.
Reprogramming the original ECM. (Engine control and Immobilizer control)
Recheck the OBD -II.
Did the DTC disappear?		 - Verify repair Go to Step 8
8 Replace the ECM.
Recheck the OBD -II test again.
Did the DTC disappear?		 - Verify repair Refer to Diagnostic Aids
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