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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  Check TP sensor and its circuit 
  1. Connect scan tool to DLC with ignition switch turned OFF.
  2. Turn ON ignition switch.
  3. Check throttle valve opening percentage displayed on scan tool while opening throttle valve from idle position to full open position.

Is it displayed 100%? 		 Go to Step 3. Intermittent trouble. Check for intermittent referring to INTERMITTENT AND POOR CONNECTION INSPECTION .
3  Check wire harness 
  1. Disconnect connector from TP sensor with ignition switch turned OFF.
  2. Check for proper connection to TP sensor at "GRY/YEL" wire terminal.
  3. If OK, then with ignition switch turned ON, measure voltage between "GRY/RED" wire terminal and "GRY/YEL" wire terminal at TP sensor connector.

Is voltage about 4 - 6 V? 		 Go to Step 4. "GRY/RED" circuit shorted to power supply line, open in "GRY/YEL" circuit or poor "C51-3- 12" terminal connection. If wire and connection are OK, substitute a known-good ECM and recheck.
4  Check TP sensor 
  1. Check resistance between terminals of TP sensor referring to THROTTLE POSITION (TP) SENSOR ON-VEHICLE INSPECTION .

Are measured values within specifications? 		 "RED/GRN" circuit shorted to power supply line.
If wire is OK, substitute a known-good ECM and recheck.		 Replace TP sensor.
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