Is a problem found?
YES – Repair as necessary. 
NO – Go to step 8.
- Turn the ignition switch OFF.
- Disconnect the MAP sensor 3P connector terminals No. 1 and No. 3 with a jumper wire.
Wire side of female terminals
MAP sensor 3P connector
JUMPER WIRE
- Turn the ignition switch ON (II).
- Check the MAP with the scan tool.
Is about 250 kPa (1,877 mmHg, 73 in. Hg) indicated?
YES – Replace the MAP sensor.
NO – Go to step 12.
- Disconnect ECM connector.
- Check the MAP sensor signal circuit, +5 V circuit and ground circuit for open/short to ground.
Wire side of female terminals
MAP sensor 3P connector
JUMPER WIRE
Wire side of female terminals
MAP sensor 3P connector
JUMPER WIRE
Is a problem found?
YES – Replace the MAP sensor circuit.
NO – Go to step 14.
- Substitute a known-good ECM and recheck. If symptom/indication goes away, replace the original ECM.
| NOTICE |
The battery power supply short circuit to 5 V power supply damages the ECM.