DTC Troubleshooting: P0108 (3-2)

DTC P0108 (3-2):  MAP Sensor Circuit High Voltage

1.Start the engine. Hold the engine at 3,000 rpm (min-1) with no load (in Park or neutral) until the radiator fan comes on, then let it idle.

2.Check the MAP with the HDS or the scan tool.

Is about 101 kPa (760 mmHg, 30 in.Hg) or higher, or about 2.9 V or higher indicated?


YES - Go to 3.


NO - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the MAP sensor and at the ECM/PCM.n


3.Turn the ignition switch OFF.

4.Disconnect the MAP sensor 3P connector.

5.Connect the MAP sensor 3P connector terminals No. 2 and No. 3 with a jumper wire.

 


6.Turn the ignition switch ON (II).

7.Check the MAP with the HDS or the scan tool.

Is about 101 kPa (760 mmHg, 30 in.Hg) or higher, or about 2.9 V or higher indicated?


YES - Go to 8.


NO - Replace the  MAP sensor.n


8.Remove the jumper wire.

9.Measure voltage between the MAP sensor 3P connector terminals No. 1 and No. 3.

 

Is there about 5 V?


YES - Go to 10.


NO - Repair open in the wire between the ECM/PCM (A11) and the MAP sensor.n


10.Turn the ignition switch OFF.

11.Connect ECM/PCM connector terminals A11 and A19 with a jumper wire.

 

12.Turn the ignition switch ON (II).

13.Check the MAP with the HDS or the scan tool.

Is about 101 kPa (760 mmHg, 30 in.Hg) or higher, or about 2.9 V or higher indicated?


YES - Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM, then recheck. If the symptom/indication goes away with a known-good ECM/PCM, replace the original  ECM/ PCM.n


NO - Repair open in the wire between the ECM/PCM (A19) and the MAP sensor.n