Mazda MX-6 1998, Workshop Manual

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TROUBLESHOOTING
DTC C1118 Torque reduction (request) signal line
DESCRIPTION
Received the torque reduction (engine condition) signal that indicates PCM detects malfunction of torque
reduction (request) signal line
POSSIBLE
CAUSE
• Malfunction of ABS/TCS CM
• Malfunction of related wiring harness
STEP
INSPECTION ACTION
1 • Connect SST (NGS).
• Select PID/DATA MONITOR.
• Select MMI SIG.
With engine idling, is duty ratio
93— 97%?
Yes Go to next step.
No
Go to step 4.
2 With ABS/TCS CM connector disconnected and
IG SW at ON, is voltage between X (+) and D (-)
of connector 5 V or more?
Yes
Go to next step.
No Inspect wiring harness between X of ABS/TCS CM and 11
of PCM for open or short.
Repair or replace as necessary.
3 With engine idling, is duty ratio between 11 (+)
and 91 (-) of PCM within specification?
Duty ratio: 70— 99%
Dwell meter reading: 0.9— 27° (4-cycle,
4-cylinder)
Yes Replace PCM.
No Replace ABS/TCS CM.
4 Is DTC present failure? Yes Replace ABS/TCS CM.
No
There was temporarily poor contact in wiring harness or
connector.
Repair or replace as necessary.
C1119 Torque reduction (engine condition) signal line
U2012 Torque reduction (engine condition) signal line
DESCRIPTION
• Torque reduction (engine condition) signal is out of specification
• Cannot distinguish whether the vehicle is ATX or MTX
POSSIBLE
CAUSE
• Malfunction of PCM
• Malfunction of related wiring harness
STEP
INSPECTION ACTION
1 • Connect SST (NGS).
• Select PID/DATA MONITOR.
• Select MMI SIG.
With engine idling, is duty ratio 15 — 70%?
Yes Go to step 4.
No Go to next step.
2 With PCM connector disconnected and IG SW at
ON, is voltage between 82 (+) and 91 (-) of PCM
5 V or more?
Yes Go to next step.
No
Inspect wiring harness between 82 of PCM and AA of
ABS/TCS CM.
Repair or replace as necessary.
3 With PCM connector connected and engine
idling, is duty ratio between
82 (+) and 91 (-) of
PCM within specification?
Duty ratio: 15— 70%
Dwell meter reading: 27— 76.5° (4-cycle,
4-cylinder)
Yes
Go to step 4.
No
Replace PCM.
4
Is DTC present failure? Yes
Replace ABS/TCS CM.
No
There was temporarily poor contact in wiring harness or
connector.
Repair or replace as necessary.
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