4.
Verify MAP voltage to change while raising or lowering simulation voltage with scan tool within 0.5~3.5 V
a.
Specification: If the data is changeable as simulation voltage changes,it’s OK
The purpose of checking ECM is to determine whether there is any malfunction of ECM .
Turn ignition switch to OFF and connect ECM and MAP harness connector.
Start engine and warm up to operating temperature.
Probe(+) : MAP harness connector NO1.
Probe(-) : Chassis ground.
Verify MAP voltage to change while raising or lowering simulation voltage with scan tool within 0.5~3.5 V
Specification: If the data is changeable as simulation voltage changes,it’s OK
Is TPS data changeable Specification?
YES
Temporarily install a known good MAP and check for proper operation.
If problem is corrected, replace MAP.
NO
ECM internal faulty.
Repair as necessary and go to "Verification of Vehicle Repair" procedure.
