Trouble Diagnoses — Self-diagnosis (Cont'd) — Judgement of Self-Diagnosis Code
AT-32flowchartApplies to A/T (automatic transmission) equipped vehicles. Self-diagnosis uses O/D OFF indicator lamp flicker patterns. t1 ≈ 2.5 seconds, t2 ≈ 2.0 seconds, t3 ≈ 1.0 second.
Self-diagnosis (Cont'd)
JUDGEMENT OF SELF-DIAGNOSIS CODE
Self-Diagnosis Code Judgement Table
All judgement flickers are same. [SAT723B] Start signal + 10-judgement flickers (Light/Shade). Timing: t1, t2, t3 pattern.
Damaged circuitAll circuits that can be confirmed by self-diagnosis are O.K.
1st judgement flicker is longer than others. [SAT724B]
Damaged circuitRevolution sensor circuit is short-circuited or disconnected. Revolution sensor connected to A/T control unit pins 16 and 15. [SAT140B] → Go to REVOLUTION SENSOR CIRCUIT CHECK.
2nd judgement flicker is longer than others. [SAT725B]
Damaged circuitSpeed sensor circuit is short-circuited or disconnected. Speed sensor connected to A/T control unit pin 24. [SAT760A] → Go to SPEED SENSOR CIRCUIT CHECK.
3rd judgement flicker is longer than others. [SAT726B]
Damaged circuitThrottle sensor circuit is short-circuited or disconnected. Throttle sensor connected via E.C.U. to A/T control unit pins 15, 11, and 10. [SAT761A] → Go to THROTTLE SENSOR CIRCUIT CHECK.
| Specification | Value |
|---|---|
| t1Self-diagnosis timing — start signal duration | ≈ 2.5seconds |
| t2Self-diagnosis timing — judgement flicker long duration | ≈ 2.0seconds |
| t3Self-diagnosis timing — judgement flicker normal duration | ≈ 1.0second |
t1Self-diagnosis timing — start signal duration
≈ 2.5seconds
t2Self-diagnosis timing — judgement flicker long duration
≈ 2.0seconds
t3Self-diagnosis timing — judgement flicker normal duration
≈ 1.0second
Self-Diagnosis Code Judgement Flowchart
1
Self-diagnosis start — O/D OFF indicator lamp
2
All judgement flickers same?
Yes
All circuits confirmed by self-diagnosis are O.K.
No
3
1st judgement flicker longer than others?
Yes
Revolution sensor circuit is short-circuited or disconnected (pins 16, 15 on A/T control unit)
Revolution sensor circuit is short-circuited or disconnected (pins 16, 15 on A/T control unit)
Go to REVOLUTION SENSOR CIRCUIT CHECK
No
4
2nd judgement flicker longer than others?
Yes
Speed sensor circuit is short-circuited or disconnected (pin 24 on A/T control unit)
Speed sensor circuit is short-circuited or disconnected (pin 24 on A/T control unit)
Go to SPEED SENSOR CIRCUIT CHECK
No
5
3rd judgement flicker longer than others?
Yes
6
Throttle sensor circuit is short-circuited or disconnected (pins 15, 11, 10 on A/T control unit via E.C.U.)
7
Go to THROTTLE SENSOR CIRCUIT CHECK
See also
REVOLUTION SENSOR CIRCUIT CHECK · SPEED SENSOR CIRCUIT CHECK · THROTTLE SENSOR CIRCUIT CHECK