PINPOINT TEST G531332P3

Pinpoint Tests

PINPOINT TEST G531332p3 : ENGINE COOLANT TEMPERATURE (ECT) SENSOR CIRCUIT RANGE/PERFORMANCE, HIGH/LOW VOLTAGE

G531332t8 : CHECK THE ECT SENSOR SENSING CIRCUIT FOR HIGH RESISTANCE
1. Key off.
2. Disconnect the ECM electrical connector, PI300.
3. Disconnect the ECT sensor electrical connector, PI25.
4. Measure the resistance between:

ECM connector PI300, ECT sensor connector PI25,
harness side harness side
Pin 68 Pin 02

- 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 G531332t9.

G531332t9 : CHECK THE ECT SENSOR SENSING CIRCUIT FOR SHORT CIRCUIT TO POWER
1. Key on, engine off.
2. Measure the voltage between:

ECT sensor connector PI25, Battery
harness side
Pin 02 Negative terminal

- 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 G531332t10.

G531332t10 : CHECK THE ECT SENSOR SENSING CIRCUIT FOR SHORT CIRCUIT TO GROUND
1. Turn the ignition switch to the OFF position
2. Measure the resistance between:

ECT sensor connector PI25, Battery
harness side
Pin 02 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
INSTALL a new ECT sensor. CLEAR the DTC. TEST the system for normal operation.