Dtc18 - Starter Degradation (For Only Vehicles Equipped With Idle Stop Function) - Isuzu 4HL1 Workshop Manual

DTC18 - Starter Degradation (For Only Vehicles Equipped with Idle Stop Function)

Circuit Description
The number of starter operations is stored to the VIM.
The VIM receives the signal from the starter switch
and, whenever the starter is set to the position "ST",
adds the count by one. When the accumulated number
of starter operations exceeds 150000, the VIM sends
the signal to the ECM to illuminate the CHECK
ENGINE lamp (the lamp blinks ten times and then goes
off) so that the driver is requested to replace the starter.
DTC18 will be set when the accumulated number of
startups exceeds 150000 on the vehicle equipped with
idle stop function and the idle stop function is enabled.
Major Faulty Event
• Poor startability
Conditions for Setting the DTC
The manual transmission vehicle is in idle stop and the
accumulated number of startups exceeds 150000.
Action Taken When the DTC Sets
After the DTC is set, the ECM will blink the CHECK
ENGINE lamp (MIL) 10 times and the turn it off.
Conditions for Clearing MIL/DTC
When the system fails and the DTC is stored to the
ECM, even repairing the faulty portion will not clear the
DTC from the memory. To clear the DTC, conduct the
following steps.
1. Turn off the idle position switch for not less than 1
second but not more than 3 seconds. (Press the
accelerator pedal.)
2. Turn on the idle position switch for not less than 1
second but not more than 3 seconds. (Release the
accelerator pedal.)
Step
Perform the "On-Board Diagnostic (OBD)
System Check".
1
Was the OBD System Check performed?
Check the accumulated number of startups.
1. Starter switch "OFF".
2. Install Tech 2.
2
3. Display
observe the count.
Is the count over 150000?
Replace the starter.
1. Check the engine runs.
2. Replace the starter.
3
3. Recheck the engine runs with the new
starter.
Is the action complete?
Action
"Engine Start Counts"
3. Turn off the idle position switch for not less than 1
second but not more than 3 seconds. (Press the
accelerator pedal.)
4. Turn on the idle position switch for not less than 1
second but not more than 3 seconds. (Release the
accelerator pedal.)
5. Turn off the idle position switch for not less than 1
second but not more than 3 seconds. (Press the
accelerator pedal.)
6. After the above operations are properly completed,
the CHECK ENGINE lamp (MIL) illuminates for 3
seconds to report the memory is cleared.
7. Turn off the starter switch. Wait for 5 seconds and
turn on the starter switch again.
When Tech 2 has been connected to the vehicle, the
DTC can be cleared through the memory clear
operation with Tech 2.
Diagnostic Aids
Poor connection or damaged harness may cause
intermittents. Check for the following conditions and, if
the fault is detected, repair or replace the faulty portion.
• Poor connection
connectors for backed-out pins, improper mating,
broken locks, improperly formed or damaged pins,
and poor pin-to-wire connection.
• Damaged harness: Inspect the wiring harness for
rubbed-through wire insulation or wire broken
inside the insulator. If the harness appears to be
OK, observe the display on Tech 2 while moving
connectors and wiring harnesses related to the
sensor. A change in the display will indicate the
location of the fault.
Value(s)
—
—
and
—
Engine Control System 1A-101
at VIM: Inspect
Yes
Go to Step 2 and go to Step 2
Go to Step 3
Go to Step 4
harness
No
Refer to OBD
System Check
Go to Step 5
—