Mazda MX-6 1998, Workshop Manual

Page: 686 / 1282

TROUBLESHOOTING [LA4A-EL]
STEP INSPECTION ACTION
BA5
CHECK VREF AT THROTTLE POSITION
SENSOR
• Key off.
• Solenoid body connector disconnected.
• TP sensor disconnected.
• Key on, engine off.
• Measure voltage between the TP sensor
VREF and TP sensor ground circuits at TP
sensor connector.
• Is voltage between 4.0 and 6.0 volts?
Yes Reconnect all components.
Unable to duplicate or identify fault at this time.
Intermittent poor connection or component malfunction
(Repair or repalace as necessary).
No VREF voltage is out of range.
Reconnect TP and solenoid body connectors.
Go to reference voltage.
or 0 1 -4 0 A POWERTRAIN CONTROL MODULE (PCM)
INSPECTION [FS]
Pinpoint test BB
CONTINUOUS
DTC P0712
Transaxle fluid temperature (TFT) 150 °C {302 °F} Indicates TFT circuit grounded
DESCRIPTION
Diagnostic trouble code (DTC) P0712 indicates a TFT sensor circuit input below the minimum acceptable
voltage
POSSIBLE
CAUSE
• Fluid level is not as specified
• Damaged TFT sensor
• Short to GND or TFT sensor ground circuit in TFT signal harness circuit
• Damaged powertrain control module (PCM)
STEP INSPECTION
ACTION
BB1
CONTINUOUS MEMORY DTC P0712: VERIFY
TFT SIGNAL VOLTAGE
• Connect NGS tester to DLC.
• Key on, engine off (KOEO).
• Access TFT PID with a NGS tester.
• Is TFT PID voltage less than 0.5 volts?
Yes The TFT signal voltage is less than the acceptable
minimum, but is not intermittent.
Go to step BA1.
No The fault that produced continuous memory DTC P0712 is
intermittent.
Go to next step.
BB2 WIGGLE TEST TFT SENSOR HARNESS
CIRCUITS
• Key on, engine off.
• Access TFT PID with a NGS tester.
• Observe TFT PID for an indication of a fault
while performing the following:
• Shake, wiggle and bend TFT signal and
TFT sensor ground circuits between
transaxle and PCM. A fault is indicated by a
sudden change in TFT PID voltage.
• Is a fault indicated?
Yes Isolate fault and service as necessary.
Reconnect all components.
Complete PCM.
Reset to clear DTCs.
Rerun OBD test.
No Reconnect all components.
Unable to duplicate or Identify fault at this time.
Intermittent poor connection or component malfunction
(Repair or repalace as necessary).
0 5 -0 1 A-11