PINPOINT TEST G532445p4 : DIAGNOSTIC MONITORING OF FUEL TANK LEAKAGE (DMTL) PUMP CONTROL CIRCUIT

Pinpoint Tests

CAUTION: When probing connectors to take measurements in the course of the pinpoint tests, use the adaptor kit, part number 3548-1358-00.

NOTE:
- When performing electrical voltage or resistance tests, always use a digital multimeter (DMM) accurate to 3 decimal places, and with an up-to-date calibration certificate. When testing resistance, always take the resistance of the DMM leads into account.
- Check and rectify basic faults before beginning diagnostic routines involving pinpoint tests.

PINPOINT TEST G532445p4 : DIAGNOSTIC MONITORING OF FUEL TANK LEAKAGE (DMTL) PUMP CONTROL CIRCUIT

G532445t7 : CHECK THE POWER SUPPLY TO THE DMTL PUMP
1. Key off.
2. Disconnect the DMTL pump electrical connector, CV09.
3. Key on, engine off.
4. Measure the voltage between:

DMTL pump connector Battery
CV09, harness side
Pin 04 Negative terminal

- Is the voltage less than 10 volts?

-> YES
REPAIR the circuit between the DMTL pump and battery. This circuit includes harness splice ECS20 and fuse 14 of the front power distribution box. Clear the DTC, test the system for normal operation.

-> NO
GO to Pinpoint Test G532445t11.

G532445t11 : CHECK THE DMTL PUMP CONTROL CIRCUIT FOR SHORT CIRCUIT TO GROUND
1. Key off.
2. Measure the resistance between:

DMTL pump connector Battery
CV09, harness side
Pin 01 Negative terminal

- Is the resistance less than 10,000 ohms?

-> YES
REPAIR the short circuit. Clear the DTC, test the system for normal operation.

-> NO
GO to Pinpoint Test G532445t12.

G532445t12 : CHECK THE DMTL PUMP CONTROL CIRCUIT FOR SHORT CIRCUIT TO POWER
1. Measure the resistance between:

DMTL pump connector Battery
CV09, harness side
Pin 01 Positive terminal

- Is the resistance less than 10,000 ohms?

-> YES
REPAIR the short circuit. Clear the DTC, test the system for normal operation.

-> NO
GO to Pinpoint Test G532445t13.

G532445t13 : CHECK THE DMTL PUMP CONTROL CIRCUIT FOR HIGH RESISTANCE
1. Disconnect the ECM electrical connector, EC300.
2. Measure the resistance between:

DMTL pump connector ECM connector EC300,
CV09, harness side harness side
Pin 01 Pin 33

- Is the resistance greater than 5 ohms?

-> YES
REPAIR the high resistance circuit. Clear the DTC, test the system for normal operation.

-> NO
INSTALL a new DMTL pump. Clear the DTC, test the system for normal operation. If the DTC is repeated, refer to the warranty policy and procedures manual if an ECM is suspect.