TROUBLESHOOTING [ENGINE CONTROL KL]
DTC
P1127
Exhaust system too cool
DESCRIPTION
• DTC P1127 indicates oxygen sensor heater was not on during key on engine running
(KOER) self-test. Accurate testing of oxygen sensor heater is energized when certain
temperature criteria is met. Heater will energize based on exhaust temperature modeling,
which allows for upstream heaters being energized independent of downstream heaters
[Possible Cause]
• Exhaust system too cool
STEP
INSPECTION
ACTION
1
CHECK HEATED OXYGEN SENSOR
HEATER RELATED PIDS
• Key off.
• NGS tester connected.
• Key on, engine on.
• Access all heated oxygen sensor heater
related PID’s.
• HTR11
• HTR21
• HTR12
• HTR13
• Do all PID indicate on?
Yes
RERUN OBD Test.
SERVICE any other DTC as necessary.
No
RUN engine until all PIDs indicate ON.
RERUN OBD Test.
SERVICE any other DTC.
01-01B -1 01
Summary of Contents for MX-6 1998
Page 1: ......
Page 501: ...STARTING SYSTEM 3 If not as specified replace the starter interlock switch 01 19 3...
Page 803: ...MANUAL TRANSAXLE W 6 U 5 1 5 W A C 05 15 7...
Page 934: ...CONTROL SYSTEM CONTROL SYSTEM STRUCTURAL VIEW W6U740WA0 07 40 2...
Page 983: ...SERVICE TOOLS 08 60 SERVICE TOOLS 08 RESTRAINTS S S T 08 60 1 08 RESTRAINTS SST 08 60 1...