Turbo Boost Gauge: Testing and Inspection

Boost Meter Circuit:

The boost meter located in the instrument panel combination gauge, is an analog gauge controlled by inputs from the ECU.

Boost Meter Testing:

COMPONENT TEST (Combination Gauge Removed)
1. With the combination gauge out of the instrument cluster, use an Ohm meter and measure the resistance between the circuit terminals as shown in image.

Resistance:
Approx. 72 ohms

HARNESS TEST
1. Disconnect the boost meter harness connector and turn "ON" the ignition switch.
2. Using a voltmeter, measure the voltage between boost meter harness connector terminal 2 and ground.


Voltage:
System Voltage

3. Turn "OFF" ignition switch and disconnect ECU harness connector.
4. Using an Ohmmeter, check for continuity between ECU harness connector terminal 111 and boost meter harness connector terminal 3.

Continuity:
Should exist.

5. Using an Ohmmeter, check for continuity (shorts) between ECU harness connector terminal 111 and ground.

Continuity:
Should not exist.

6. Using an Ohmmeter, check for continuity (shorts) between boost meter harness connector terminal 3 and ground.

Continuity:
Should not exist.


If any of the previous tests produce unsatisfactory results, the harness will need to be repaired or replaced. Once repairs have been completed, road test the vehicle to confirm that the repair has corrected the problem and the code doesn't return.
If the trouble returns, it is possible that there is an intermittent failure of the component or the ECU. Check for looseness at all harness junctions and test for an intermittent failure.