2001 INFINITI QX4 Factory Service Manual

Page 249 of 2395

INFINITI QX4 2001  Factory Service Manual 6 CHECK SYMPTOM
Check again.
OK or NG
OK©INSPECTION END
NG©1. Perform TCM input/output signal inspection.
2. If NG, recheck TCM pin terminals for damage or loose connection with harness con-
nector.

Page 250 of 2395

INFINITI QX4 2001  Factory Service Manual 12. A/T Does Not Perform Lock-up=NBAT0084SYMPTOM:
A/T does not perform lock-up at the specified speed.
1 CHECK SELF-DIAGNOSTIC RESULTS
Does self-diagnosis show damage to torque converter clutch soleno

Page 251 of 2395

INFINITI QX4 2001  Factory Service Manual 4 CHECK SYMPTOM
Check again.
OK or NG
OK©INSPECTION END
NG©1. Perform TCM input/output signal inspection.
2. If NG, recheck TCM pin terminals for damage or loose connection with harness con-
nector.

Page 252 of 2395

INFINITI QX4 2001  Factory Service Manual 13. A/T Does Not Hold Lock-up Condition=NBAT0085SYMPTOM:
A/T does not hold lock-up condition for more than 30 seconds.
1 CHECK DIAGNOSTIC RESULTS
Does self-diagnosis show damage to engine speed signal

Page 253 of 2395

INFINITI QX4 2001  Factory Service Manual 4 CHECK SYMPTOM
Check again.
OK or NG
OK©INSPECTION END
NG©1. Perform TCM input/output signal inspection.
2. If NG, recheck TCM pin terminals for damage or loose connection with harness con-
nector.

Page 254 of 2395

INFINITI QX4 2001  Factory Service Manual 14. Lock-up Is Not Released=NBAT0086SYMPTOM:
Lock-up is not released when accelerator pedal is released.
1 CHECK THROTTLE POSITION SWITCH CIRCUIT
With CONSULT-II
Does ªTCM INPUT SIGNALSº in Data Mon

Page 255 of 2395

INFINITI QX4 2001  Factory Service Manual 15. Engine Speed Does Not Return To Idle
(Light Braking D
4®D3)=NBAT0087SYMPTOM:
IEngine speed does not smoothly return to idle when A/T
shifts from D
4to D3.
IVehicle does not decelerate by engine b

Page 256 of 2395

INFINITI QX4 2001  Factory Service Manual 3 CHECK A/T FLUID CONDITION
1. Remove oil pan.
2. Check A/T fluid condition.
SAT171B
OK or NG
OK©GO TO 4.
NG©GO TO 6.
4 DETECT MALFUNCTIONING ITEM
1. Remove control valve assembly. Refer to AT-273.