DTC Troubleshooting

DTC DIAGNOSTIC TROUBLESHOOTING CHART

Step	Action	YES	NO
1	Was "Engine and Emission Control System Check" performed?	Go to Step 2.	Go to ENGINE AND EMISSION CONTROL SYSTEM CHECK .
2	Is DTC P0107 or P0108 indicated?	Go to DTC P0107 / P0108: Manifold Absolute Pressure Circuit Low Input / High Input .	Go to Step 3.
3	MAP sensor power supply voltage check Disconnect connector from MAP sensor with ignition switch turned OFF. Check for proper connection of MAP sensor connector at "GRY/RED", "GRY/YEL" and "RED/WHT" wire terminals. If OK, with ignition switch turned ON, measure voltage between engine ground and "GRY/RED" wire terminal of MAP sensor connector. Is voltage 4 - 5 V?	Go to Step 4.	"GRY/RED" wire is shorted to other circuit.
4	MAP sensor signal check Disconnect connectors from ECM with ignition switch turned OFF. Check for proper connection of ECM connector at "C51-3-8", "C51-3-14" and "C51-3-25" terminal. If OK, measure resistance between "C51-3-8" terminal of ECM connector and "RED/WHT" wire terminal of MAP sensor connector. Is resistance below 5 Ω?	Go to Step 5.	High resistance wire in "RED/WHT" circuit.
5	MAP sensor ground circuit check Measure resistance between "C51-3-25" terminal of ECM connector and "GRY/YEL" wire terminal of MAP sensor connector. Is resistance below 5 Ω?	Go to Step 6.	High resistance wire in "GRY/YEL" circuit.
6	MAP sensor signal check Measure resistance between "C51-3-14" terminal of ECM connector and "GRY/RED" wire terminal of MAP sensor connector. Is resistance below 5 Ω?	Go to Step 7.	High resistance wire in "GRY/RED" circuit.
7	MAP sensor signal check With ignition switch turned ON. Measure voltage between engine ground and "RED/WHT" wire terminal of MAP sensor connector. Is voltage 0 V?	Go to Step 8.	"RED/WHT" wire shorted to other circuits.
8	MAP sensor check Check MAP sensor referring to MANIFOLD ABSOLUTE PRESSURE (MAP) SENSOR INSPECTION . Is it in good condition?	Substitute a known-good ECM and recheck.	Faulty MAP sensor.