Mazda MX-6 1998, Руководство по ремонту

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TROUBLESHOOTING [LA4A-EL]
Pinpoint test BA
KOEO, KOER
DTC P0712
Transaxle fluid temperature (TFT) 150 ”C {302 °F} indicates TFT circuit grounded
DESCRIPTION
Self-test diagnostic trouble code (DTC) P0712 indicates a TFT sensor circuit input below the minimum
acceptable voltage.
POSSIBLE
CAUSE
• Fluid level not as specified
• Damaged TFT sensor
• Short to TFT sensor ground circuit in TFT signal harness circuit
• Damaged PCM
STEP INSPECTION ACTION
BA1
KEY ON ENGINE ON (KOEO) AND KEY ON
ENGINE RUNNING (KOER) DTC P0712:
ATTEMPT TO INDUCE OPPOSITE CONDITION
• Key off.
• Connect NGS tester to DLC.
• Disconnect transaxle connector. Inspect for
damaged or pushed out pins, corrosion, loose
wires, etc. service as necessary.
• Activate KOEO and KOER self-tests (transaxle
connector remains disconnected).
• Is DTC P0713 present?
Note
• Disregard any other DTCs generated at this
time.
Yes The fault that produced DTC P0712 is not within the TFT
harness circuits or the PCM.
Go to BA4.
No The opposite condition could not be induced.
Go to next step.
BA2 CHECK CONSTANT VOLTAGE AT THE
THROTTLE POSITION SENSOR
• Key off.
• Transaxle connector disconnected.
• Disconnect throttle position (TP) sensor.
• KOER.
• Measure voltage between the TP sensor
VREF and TP sensor ground circuits at the TP
sensor vehicle harness connector.
• Is voltage between 4.0 and 6.0 volts?
Yes
VREF voltage is in range.
Reconnect TP sensor.
Go to next step.
No VREF voltage is out of range.
Reconnect transaxle connector.
Go to reference voltage test.
c
r
01-40A POWERTRAIN CONTROL MODULE (PCM)
INSPECTION [FS]
BA3 CHECK TFT SIGNAL CIRCUIT FOR SHORTS
TO GROUND AND TFT SENSOR GROUND
CIRCUIT
• Key off.
• Transaxle connector disconnected.
• Disconnect PCM. Inspect for damaged or
pushed out pins, corrosion, loose wires, etc.
Service as necessary.
• Install breakout box, leave PCM disconnected.
• Measure resistance between test pin 37 and
Test Pins 24, 61, 7 6 ,1 0 3 and 91 at the
breakout box.
• Is each resistance greater than 10,000 ohms?
Yes Repalace damaged PCM.
Remove breakout box.
Reconnect all components.
Rerun OBD test.
No Service short circuit between TFT SIGNAL and POWER
GROUND or TFT SENSOR GROUND CIRCUIT.
Reconnect all components.
Remove breakout box.
Rerun OBD test.
BA4
KOEO
&
KOER DTC P0712
—
ATTEMPT TO
INDUCE OPPOSITE CONDITION
• Key off.
• Disconnect solenoid body connector.
• Using a mirror, inspect both ends of the
connector for damaged or pushed out pins,
corrosion, loose wires, and missing or
damaged seals.
• With solenoid body connector still
disconnected, perform KOEO and KOER tests.
Note
• Disregard any other DTCs generated at this
time.
• Is DTC P0713 present?
Yes
The fault that produced DTC P0712 is not within the TFT
harness circuits or the PCM.
Go to Pinpoint test BC.
No
The opposite condition could not be induced.
Go to next step.
0 5 -0 1 A -1 0