Check cable and terminal integrity:
- Engine ECM pin B23
- Engine ECM pin B18
- Engine ECM pin C29
- MAP sensor pin 1, 2, 3
Disconnect MAP sensors
and proceed to test 2
Rectify fault, proceed to
test 4
Check cable for short circuit:
- Engine ECM pin C29 to Engine
ECM pin B23
- Engine ECM pin C29 to Engine
ECM pin B18
- Engine ECM pin B18 to Engine
ECM pin B23
- Engine ECM pin B18 to ground
- Engine ECM pin C29 to ground
Locate and rectify wiring
fault, proceed to test 4
Check cable for continuity:
- Engine ECM pin B18 to MAP
sensor pin 3
- Engine ECM pin B23 to MAP
sensor pin 1
- Engine ECM pin C29 to MAP
sensor pin 2
Renew relevant MAP
pressure sensor, proceed to
test 4
Locate and rectify wiring
fault, proceed to test 4
Reconnect harness, clear fault code
and run engine.
Action complete - quit test