P0108-MANIFOLD ABSOLUTE PRESSURE SENSOR CIRCUIT HIGH





For a complete wiring diagram Refer to Section 8W.


  • When Monitored:

    Engine speed between 600 to 3500 RPM. Battery voltage greater than 10.37 volts.

  • Set Condition:

    The MAP sensor signal voltage is greater than 4.92 volts for 3.0 seconds. One trip fault. Three good trips to turn off the MIL. MIL will illuminate and the ETC light will flash if equipped.


Possible Causes
 
(K1) MAP SIGNAL CIRCUIT SHORTED TO BATTERY VOLTAGE
 
(K1) MAP SIGNAL CIRCUIT OPEN
 
(K1) MAP SIGNAL CIRCUIT SHORTED TO THE (F856) 5-VOLT SUPPLY CIRCUIT
 
(K900) SENSOR GROUND CIRCUIT OPEN
 
MAP SENSOR
 
PCM
 


Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).



Diagnostic Test

1.MAP SENSOR VOLTAGE ABOVE 4.92 VOLTS




Is the voltage above 4.92 volts?

Yes
  • Go To 2


No

2.MAP SENSOR









Is the voltage below 1.0 volt with the jumper wire installed?

Yes


No
  • Go To 3

    NOTE: Remove the jumper wire before continuing.


3.(K1) MAP SIGNAL CIRCUIT SHORTED TO BATTERY VOLTAGE








Is the voltage above 5.2 volts?

Yes


No
  • Go To 4

4.(K1) MAP SIGNAL CIRCUIT OPEN




CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install Miller Special Tool #8815 to perform diagnosis.




Is the resistance below 5.0 ohms?

Yes
  • Go To 5


No

5.(K1) MAP SIGNAL CIRCUIT SHORTED TO THE (F856) 5-VOLT SUPPLY CIRCUIT





Is the resistance below 100 ohms?

Yes


No
  • Go To 6

6.(K900) SENSOR GROUND CIRCUIT OPEN





Is the resistance below 5.0 ohms?

Yes
  • Go To 7


No

7.PCM

NOTE: Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary.




Were there any problems found?

Yes


No