DTC 63

Chart - Code 63 MAP Sensor (Signal Voltage High - Low Vacuum):

Wiring Diagram for MAP Sensor:

CODE 63 MANIFOLD ABSOLUTE PRESSURE (MAP) SENSOR CIRCUIT (SIGNAL VOLTAGE HIGH )


Circuit Description:
The manifold absolute pressure sensor (MAP) responds to changes in manifold pressure (vacuum). The ECM receives this information as a signal voltage that will vary from about 1 to 1.5 volts at idle (high vacuum) to 4 to 4.5 volts at wide open throttle (low vacuum).


Test Description:Numbers below refer to circled numbers on the diagnostic chart.
1. Code 63 will set when:
Engine running
Manifold pressure greater than 75.3 kPa (A/C "OFF") 81.2 kPa (A/C "ON")
Throttle angle less than 2%
Conditions met for 2 seconds
Engine misfire or a low unstable idle may set Code 63.
2. With the MAP sensor disconnected, the ECM should see a low voltage if the ECM and wiring are OK.


Diagnostic Aids:

If idle is rough or unstable, refer to "Symptoms" in "DIAGNOSIS BY SYMPTOM - NO TROUBLE CODE STORED", for items which can cause an unstable idle. An open in CKT 452 or the connection will result in a Code 63. Ignition "ON" engine "OFF," voltages should be within the values shown in the table on the chart. Also CHART C-1D can be used to test the MAP sensor. Refer to "Intermittents" in "DIAGNOSIS BY SYMPTOM - NO TROUBLE CODE STORED".