Mazda MX-6 1998, Workshop Manual

Page: 306 / 1282

TROUBLESHOOTING [ENGINE CONTROL KL]
DTC P1124 TP sensor input signal out of self-test range
DESCRIPTION
• TP sensor’s rotational setting is not in self-test range of 13.23 to 24.02% (0.43 to 1.17
volts)
[Possible Cause]
• Binding or bent throttle linkage • Throttle plate/screw misadjusted
• TP sensor may not be seated properly (tightened down) • Damaged TP sensor
• Throttle plate below closed throttle position • Damaged PCM
STEP INSPECTION
ACTION
1 CHECK FOR OTHER DTCS
• Active KOEO and KOER self-test.
• Is KOEO or KOER DTC present?
Yes Go to appropriate DTC text.
No Go to next step.
2 CHECK FOR STUCK THROTTLE PLATE OR
LINKAGE
• Visually Inspect throttle body and throttle
linkage for binding or sticking.
• Verify throttle plate and linkage is at closed
throttle position.
• Does throttle move freely and return to
closed throttle position?
Yes
Throttle plate and linkage are okay.
No
SERVICE as necessary.
RERUN OBD Test.
DTC P1125 TP sensor circuit intermittent
DESCRIPTION
• Continuous Memory DTC P1125 indicates TP sensor signal went below 9.80% (0.17 volts)
or above 92.27% (4.60 volts) sometime during last 80 warm up cycles
[Possible Cause]
• TP sensor connector with poor continuity • TP sensor internal electrical or substrate open or
• TP-sensor harness with poor continuity electrical short
• TP sensor harness intermittent short
STEP INSPECTION ACTION
1
CHECK FOR TP CIRCUIT INTERMITTENT
VOLTAGE INPUT
• Start engine and bring to Idle.
• Run engine up to 1,500 rpm for 5 seconds.
• Key on, engine running.
• Access TP V PID for fault indication with
NGS tester while performing following:
• Lightly tap on TP sensor and wiggle
harness connector to simulate road
shock
• Is TP
V
PID changing below minimum
0.49
volts or above maximum
4.60
volts?
Yes DISCONNECT and INSPECT TP sensor connector.
If okay, REPLACE TP sensor.
RESET PCM to completely clear DTCs.
c r After Repair Procedure
COMPLETE OBD II Drive Mode.
RERUN OBD Test.
No Go to next step.
2 CHECK TP SENSOR HARNESS TO PCM
FOR INTERMITTENT OPENS OR SHORTS
• Key off.
• Disconnect PCM. Inspect for damaged or
pushed out pins, corrosion, loose wires,
etc. Service as necessary.
• Install breakout box. Reconnect PCM.
• Key on, engine off.
• Connect DVOM between Test Pin 89 and
Test Pin 91 at breakout box.
• W hile viewing DVOM, do following:
• Grasp vehicle harness closest to TP
sensor connector
• Shake and bend small section of
harness all way to dash panel
• Wiggle, shake and bend harness from
dash panel to PCM
•
Is voltage changing below minimum
0.49 volts or above maximum 4.60
volts?
Yes ISOLATE fault and SERVICE as necessary.
RECONNECT all components.
RESET PCM to completely clear DTCs.
zr After Repair Procedure
COMPLETE OBD II Drive Mode.
RERUN OBD Test.
No Unable to duplicate and/or identify fault at this time.
Intermittent poor connection or component malfunction
(REPAIR or REPLACE as necessary).
Go to ENGINE SYMPTOM TROUBLESHOOTING No.27.
01-01B -100