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Home › Isuzu › 2004 › Axiom Base, 4WD › Repair and Diagnosis › Engine Performance › System › Engine DRIVEABILITY And Emissions - DTC P0452 To P1221 › DTC P0462: Fuel Level Sensor Circuit Low Input › Test Description

Test Description

Number(s) below refer to the step number(s) on the Diagnostic Chart.

  1. 8. The following chart can be used to check the sending unit:
DTC P0462- FUEL LEVEL SENSOR CIRCUIT LOW INPUT

Step Action Values Yes No
1 Was the "On-Board Diagnostic (OBDII) System Check" performed? - Go to Step 2 Go to On-Board Diagnostic (OBD-II) System Check
2
  1. Disconnected the fuel level sensor harness from its connector at the fuel tank.
  2. Ignition "ON", Engine "OFF".
  3. Using a DVM, measure the voltage between the sensor harness positive and ground wires.
Is the voltage approximately equal to the specified value?		 5 V Go to Step 6 Go to Step 3
3
  1. Ignition "ON", Engine "OFF".
  2. With a DVM, backprobe the ECM connector at the terminal which supplies 5 volts to the fuel level sensor.
Is the voltage approximately equal to the specified value?		 5 V Go to Step 4 Go to Step 8
4
  1. Ignition "ON", Engine "OFF".
  2. Fuel level sensor disconnected from wiring harness.
  3. With a DVM, probe the 5 -volt supply wire at the sensor harness.
Is the voltage approximately equal to the value measured in Step 4?		 - Go to Step 5 Go to Step 11
5
  1. Locate for open or high resistance connection in the ground wire between the ECM and the fuel level sensor.
  2. Repair wiring harness.
Is the action complete?		 - Verify repair -
6 Remove the fuel level sensor and check the following:
  1. Does the arm move freely?
  2. Are the wires open or intermittently open when wiggled?
  3. Do The resistance values match the specification chart?

Was a problem found?		 - Go to Step 7 Go to Step 11
7 Replace the fuel level sensor.
Is the action complete?		 - Verify repair -
8 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 9 Go to Step 2
9 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 10
10 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 11
11 Replace the ECM.
Recheck the OBD -II test again.
Did the DTC disappear?		 - Verify repair Refer to Diagnostic Aids 
12 Repair short to ground between the ECM connector and the fuel level sensor.
Is the action complete?		 - Verify repair -
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