Isuzu D-Max / Isuzu Rodeo (TFR/TFS). Manual - part 642

7A1–68 AUTOMATIC TRANSMISSION (4L30-E)

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A

NO

YES

YES

NO

•

Connect voltmeter between connector C-96
terminal A12 and ground connector C-95
terminal C1.

•

Ignition switch ON.

IF: display indicates approximately 0 volt:

Check for faulty TCM
connectors.
IF OK GOTO TCM
MEM-CAL
REPLACEMENT.

Check wire for a short
to voltage between
terminal A12 and
speed sensor
connector M-15.

Repair.

AUTOMATIC TRANSMISSION (4L30-E) 7A1–69

MEMO

7A1–70 AUTOMATIC TRANSMISSION (4L30-E)

DIAGNOSTIC TROUBLE CODE (DTC) 13

ENGINE SPEED FAILURE

This DTC flashes the CHECK TRANS indicator and
set the BACKUP MODE.

Circuit Description:

The Engine Control Module (ECM) sends a signal to
the Transmission Control Module (TCM) that
indicates engine speed in RPM. When the vehicle is
in neutral gear and the engine is at idle, the engine
speed should be approximately 800 RPM.

Diagnostic Aids:

•

This Diagnostic is not an electrical test done by
the TCM but a test between different information
(“logic test”).

•

Detection conditions:
1 Engine speed < or = 200 RPM.
2 Output Speed > 1024 RPM.
3 Acceleration > 2 Km/h/s.
4 No DTC: Output Speed DTC11, Downshift

Protection DTC62 or Mode Switch Illegal
Position DTC54.

5 Selector Lever not in Park or Neutral.
6 The conditions need to be present for at least

0.5 second.

•

Action after the detection time: BACKUP MODE

•

Recovery conditions: To recover do an IGNITION
CYCLE

ENGINE
RPM
INPUT

TRANSMISSION
CONTROL
MODULE (TCM)

ECM

TACHOMETER  ( METER

C-95

D12(28)

ENGINE
RPM
OUTPUT

B-24

3

 )

H-20

6

12

E-61

BLK/RED

BLK/RED

H-6

16

D07LW007

AUTOMATIC TRANSMISSION (4L30-E) 7A1–71

DIAGNOSTIC TROUBLE CODE (DTC) 13

ENGINE SPEED FAILURE

Install scan tool.
GOTHROUGH TECH2 CONNECTION.

•

Engine running at idle.

•

Brake applied.

•

Selector lever position “N” or “P”.

•

Selector “F0: DATA LIST: AT INPUT
SPEED”.

IF: TECH2 DISPLAY approximately 800

RPM:

This system is functioning correctly.
The problem is probably intermittent.
GOTO
INTERMITTENT CONDITIONS.

IF: Tachometer displays engine speed?

•

Check wire for open or short to ground or short to
voltage between Tachometer connector B-24
terminal 3 and engine control module (ECM)
connector E-61 terminal 12 or between these
terminals and intermediate connector H-6 terminal
16.

•

Repair harness.  If still not working:
Check Engine electrical section.
If still problem, replace engine control module
(ECM).

YES

NO

YES

NO

•

Check wire for open or short to ground or short to
voltage between Transmission Control Module (TCM)
and connector C-95 & C-96, and connector C-95
terminal D12 and engine control module (ECM)
connector E-61 terminal 12, and check intermediate
connector H-20 terminal 6.

•

Repair harness. If still not working: GOTO TCM MEM-
CAL REPLACEMENT.