Isuzu KB P190. Service manual — part 592
6E–198
ENGINE DRIVEABILITY AND EMISSIONS
9
Using the DVM and check the VSS ground circuit.
1. Ignition “On”, engine “Off”.
2. Disconnect the VSS connector.
3. Check the circuit for short to power supply circuit.
Was the DVM indicated specified value?
Less than 1V
Go to Step 10
Repair faulty
harness and
verify repair
10
Using the DVM and check the VSS ground circuit.
1. Ignition “Off”, engine “Off”.
2. Disconnect the VSS connector.
3. Check the circuit for open circuit.
Was the problem found?
—
Repair faulty
harness and
verify repair
Go to Step 19
11
Using the DVM and check the VSS signal circuit.
1. Ignition “On”, engine “Off”.
2. Disconnect the VSS connector and meter
connector.
3. Check the circuit for short to power supply circuit.
Was the DVM indicated specified value?
Less than 1V
Go to Step 12
Repair faulty
harness and
verify repair
Step
Action
Value(s)
Yes
No
V
E-44
2
E-44
2
V
B-24
9
ENGINE DRIVEABILITY AND EMISSIONS
6E–199
12
Using the DVM and check the VSS signal circuit.
1. Ignition “Off”, engine “Off”.
2. Disconnect the VSS connector and meter
connector.
3. Check the circuit for open or short to ground
circuit.
If a open or short to ground circuit is found, repair the
faulty harness and verify repair.
Is the action complete?
—
Verify repair
—
13
Replace the speed meter.
Is the action complete?
—
Verify repair
—
14
Using the DVM and check the VSS signal circuit.
1. Ignition “On”, engine “Off”.
2. Disconnect the meter connector and immobilizer
control unit connector (if equipped).
3. Check the circuit for short to power supply circuit.
Was the DVM indicated specified value?
Less than 1V
Go to Step 15
Repair faulty
harness and
verify repair
15
Using the DVM and check the VSS signal circuit.
1. Ignition “Off”, engine “Off”.
2. Disconnect the meter connector and immobilizer
control unit connector (if equipped).
3. Check the circuit for open or short to ground
circuit.
If a open or short to ground circuit is found, repair the
faulty harness and verify repair.
Is the action complete?
—
Verify repair
—
Step
Action
Value(s)
Yes
No
B-24
9
E-44
3
V
B-68
6
B-24
10
B-68
6
6E–200
ENGINE DRIVEABILITY AND EMISSIONS
16
Replace the immobilizer control unit (if equipped).
Is the action complete?
—
Verify repair
—
17
Using the DVM and check the VSS signal circuit.
1. Ignition “Off”, engine “Off”.
2. Disconnect the immobilizer control unit connector
(if equipped) and ECM connector.
3. Ignition “On”.
4. Check the circuit for short to power supply circuit.
Was the DVM indicated specified value?
Less than 1V
Go to Step 18
Repair faulty
harness and
verify repair
18
Using the DVM and check the VSS signal circuit.
Breaker box is available:
1. Ignition “Off”, engine “Off”.
2. Install the breaker box as type A. (ECM
disconnected) Refer to 6E-88 page.
3. Disconnect the immobilizer control unit connector
(if equipped).
4. Check the circuit for open or shot to ground circuit.
Was the problem found?
Breaker box is not available:
1. Ignition “Off”, engine “Off”.
2. Disconnect the immobilizer control unit connector
(if equipped) and ECM connector.
3. Check the circuit for open or short to ground
circuit.
Was the problem found?
—
Repair faulty
harness and
verify repair
Go to Step 21
19
Substitute a known good VSS and recheck.
Was the problem solved?
—
Go to Step 20
Go to Step 21
Step
Action
Value(s)
Yes
No
V
C-56(J2)
23
J2-32
Breaker Box
B-68
7
Ω
Ω
B-68
C-56(J2)
23
8
ENGINE DRIVEABILITY AND EMISSIONS
6E–201
20
Replace the VSS.
Was the problem solved?
—
Verify repair
Go to Step 21
21
Is the ECM programmed with the latest software
release?
If not, download the latest software to the ECM using
the “SPS (Service Programming System)”.
Was the problem solved?
—
Verify repair
Go to Step 22
22
Replace the ECM.
Is the action complete?
IMPORTANT: The replacement ECM must be
programmed. Refer to section of the Service
Programming System (SPS) in this manual.
Following ECM programming, the immobilizer system
(if equipped) must be linked to the ECM. Refer to
section 11 “Immobilizer System-ECM replacement” for
the ECM/Immobilizer linking procedure.
—
Verify repair
—
Step
Action
Value(s)
Yes
No
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