PINPOINT TEST G258127p36

Pinpoint Tests

PINPOINT TEST G258127p36 : P1251, P1631, P1657, P1658; THROTTLE MOTOR RELAY CONTROL CIRCUIT MALFUNCTION/OFF FAILURE/ON FAILURE

G258127t161 : CHECK THE THROTTLE MOTOR RELAY POWER SUPPLIES
1. Remove the throttle motor relay.
2. Turn the ignition switch to the ON position.
3. Measure the voltage between the relay base, pins 01 and 03 and GROUND.

- Is either voltage less than 10 volts?

->YES
REPAIR the circuit between the relay base and battery. This circuit includes the front power distribution box (fuse 14). CLEAR the DTC. TEST the system for normal operation.

->NO
GO to Pinpoint Test G258127t162.

G258127t162 : CHECK THE THROTTLE MOTOR RELAY COIL DRIVE CIRCUIT FROM THE ECM FOR HIGH RESISTANCE
1. Turn the ignition switch to the OFF position.
2. Disconnect the battery negative terminal.
3. Disconnect the ECM electrical connector, PI01.
4. Measure the resistance between the relay base, pin 02 and PI01, pin 52 (GR).

- Is the resistance greater than 5 Ohms?

->YES
REPAIR the high resistance circuit. CLEAR the DTC. TEST the system for normal operation.

->NO
GO to Pinpoint Test G258127t163.

G258127t163 : CHECK THE THROTTLE MOTOR RELAY COIL DRIVE CIRCUIT FROM THE ECM FOR SHORT TO B +
1. Reconnect the battery negative terminal.
2. Measure the voltage between the relay base, pin 02 and GROUND.

- Is the voltage greater than 3 volts?

->YES
REPAIR the short circuit. CLEAR the DTC. TEST the system for normal operation.

->NO
GO to Pinpoint Test G258127t164.

G258127t164 : CHECK THE POWER SUPPLY CIRCUIT FROM THE RELAY BASE TO THE ECM FOR HIGH RESISTANCE
1. Measure the resistance between the relay base, pin 05 and PI01, pin 134 (GU).

- Is the resistance greater than 5 Ohms?

->YES
REPAIR the high resistance circuit. This circuit includes the front power distribution box (fuse 24). CLEAR the DTC. TEST the system for normal operation.

->NO
GO to Pinpoint Test G258127t165.

G258127t165 : CHECK THE POWER SUPPLY CIRCUIT FROM THE RELAY BASE TO THE ECM FOR SHORT TO B +
1. Measure the voltage between the relay base, pin 05 and GROUND.

- Is the voltage greater than 3 volts?

->YES
REPAIR the short circuit. CLEAR the DTC. TEST the system for normal operation.

->NO
INSTALL a new throttle motor relay. CLEAR the DTC. TEST the system for normal operation.