Isuzu Amigo / Axiom / Trooper / Rodeo / VehiCross. Manual - part 1124

3F–26

INTELLIGENT SUSPENSION

DTC7 Engine Speed Signal Open Circuit or Short

Circuit Description

PCM (Powertrain Control Module) converts signals from
the crankshaft position sensor into the engine speed
signals (pulse) and sends these to the control unit and
tachometer.

Diagnostic Aids

• Inspect the wiring for poor electrical connections at

the control unit connector. Look for possible bent,
backed out, deformed, or damaged terminals. Check
for weak terminal tension as well.
Also check for a chafed wire that could short to bare
metal or other wiring. Inspect for a broken wire inside
the insulation.

• When diagnosing for a possible intermittent short or

open condition, move the wiring harness while
observing test equipment for a change.

• Check harness routing for a potential short to ground

in circuit BLK/RED.

DTC7 Engine Speed Signal Open Circuit or Short

Step

Action

Value(s)

Yes

No

1

NOTE:  Confirm that DTC P0336 or P0337 does not
exist.
If either exists, warning lamps, “CHECK ENGINE" and
“CHECK TRANS" are turned on. Repair the engine,
referring to Section 6E “Driveability and Emission".

1. Turn on the starter switch.

2. Start the engine.

3. Open the throttle and rev up engine speed.

Does the tachometer operate according to engine
speed?

—

Go to Step 3   

Go to Step 2   

2

Repair the tachometer, referring to Section 8D Wiring
System in Body and Accessories.

—

Go to Step 6   

—

3

1. Turn off the starter switch.

2. Check continuity between the control unit

connector C–52 terminal 59 and PCM connector
E–21 terminal F7.

Is there continuity ?

—

Go to Step 4   

Go to Step 5   

4

Replace the control unit.

—

Go to Step 6   

—

5

Repair the circuit.

—

Go to Step 6   

—

6

1. Reconnect all components, ensure all

components are properly mounted.

2. Clear the DTC.

3. Conduct a test drive.

Has the last test failed or does the current DTC exist?

—

Begin 

diagnosis 

again

Go to Step 1

Repair verified 

INTELLIGENT SUSPENSION

3F–27

DTC9 Control Unit Abnormality

Replace the control unit.

DTC9–1 Control Unit Blown Fuse for FR Actuator

Step

Action

Value(s)

Yes

No

1

1. Turn off the starter switch.

2. Disconnect the actuator connector C–44.

3. Measure the resistance between the actuator side

connector C–44 terminals 1 and 2.

Is the resistance within the specified value? 

6.4– 7.2

W

Go to Step 2   

Go to Step 3   

2

1. Measure the resistance between the actuator side

connector C–44 terminals 3 and 4.

Is the resistance within the specified value? 

6.4– 7.2

W

Go to Step 4   

Go to Step 3   

3

Replace the actuator FR.

—

Go to Step 7   

—

4

1. If all steps are correct, check the continuity

between the control unit connector C–50 terminal
1 and connector-terminal C50–4, C50–17, C50–5,
C50–18.

Is there continuity?

—

Go to Step 5   

Go to Step 6   

5

Repair the circuit.

—

Go to Step 7   

—

6

Replace the control unit.

—

Go to Step 7   

—

7

1. Reconnect all components, ensure all

components are properly mounted.

2. Clear the DTC.

Was this step finished?

—

Go to “Basic 

Diagnosis 

FLow". Go 

to 

Step 7   

3F–28

INTELLIGENT SUSPENSION

DTC9–2 Control Unit Blown Fuse for FL Actuator

Step

Action

Value(s)

Yes

No

1

1. Turn off the starter switch.

2. Disconnect the actuator connector C–45.

3. Measure the resistance between the actuator side

connector C–45 terminals 1 and 2.

Is the resistance within the specified value? 

6.4– 7.2

W

Go to Step 2   

Go to Step 3   

2

1. Measure the resistance between the actuator side

connector C–45 terminals 3 and 4.

Is the resistance within the specified value? 

6.4– 7.2

W

Go to Step 4   

Go to Step 3   

3

Replace the actuator FL.

—

Go to Step 7   

—

4

1. If all steps are correct, check the continuity

between the control unit connector C–50 terminal
1 and connector-terminal C50–6, C50–19, C50–7,
C50–20.

Is there continuity?

—

Begin 

diagnosis 

again

Go to Step 5

Go to Step 6   

5

Repair the circuit.

—

Go to Step 7   

—

6

Replace the control unit.

—

Go to Step 7   

—

7

1. Reconnect all components, ensure all

components are properly mounted.

2. Clear the DTC.

Was this step finished?

—

Go to “Basic 

Diagnosis 

FLow". Go 

to 

Step 7   

INTELLIGENT SUSPENSION

3F–29

DTC9–3 Control Unit Blown Fuse for RR Shock Absorber

Step

Action

Value(s)

Yes

No

1

1. Turn off the starter switch.

2. Disconnect the shock absorber connector F–6.

3. Measure the resistance between the shock

absorber side connector F–6 terminals 3 and 4.

Is the resistance within the specified value? 

6.4– 7.2

W

Go to Step 2   

Go to Step 3   

2

1. Measure the resistance between the shock

absorber side connector F–6 terminals 7 and 8.

Is the resistance within the specified value? 

6.4– 7.2

W

Go to Step 4   

Go to Step 3   

3

Replace the shock absorber RR.

—

Go to Step 7   

—

4

1. If all steps are correct, check the continuity

between the control unit connector C–50 terminal
1 and connector-terminal C50–8, C50–21, C50–9,
C50–22.

Is there continuity?

—

Begin 

diagnosis 

again

Go to Step 5

Go to Step 6   

5

Repair the circuit.

—

Go to Step 7   

—

6

Replace the control unit.

—

Go to Step 7   

—

7

1. Reconnect all components, ensure all

components are properly mounted.

2. Clear the DTC.

Was this step finished?

—

Go to “Basic 

Diagnosis 

FLow". Go 

to 

Step 7