Starter System Circuit Troubleshooting (With Auto Idle Stop System) (2021)

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Starter System Circuit Troubleshooting

Special Tools Required

Honda GR8 Battery Diagnostic Station with AST Module (12 Volt) MTRGR811ASTH*

*: Available through the Honda Tool and Equipment Program 888-424-6857

NOTE:

Air temperature must be between 59-100 deg.F (15-38 deg.C) during this procedure.
After the inspection, you must reset the PCM . Otherwise, the PCM will continue to stop the fuel injectors from operating.
The 12 volt battery must be in good condition and fully charged.

PGM-FI, CVT, and Keyless Access system DTC check

-1. Connect the HDS to the DLC .

-2. Check for PGM-FI, CVT, and Keyless Access system DTCs with the HDS. If you fail to enter the SYSTEM SELECTION MENU with the HDS, go to the keyless access system symptom troubleshooting "Cannot select ON mode with keyless access and with the keyless remote touching the engine start/stop switch" .

PGM-FI system

DTC Description	Confirmed DTC	Pending DTC

CVT system

DTC Description	Confirmed DTC	Pending DTC	Freeze Frame

Keyless Access system

DTC Description	DTC

Are any DTCs indicated?

YES

Go to the indicated DTC's troubleshooting.

Go to step 2.

Starting system check 1
-1. Select ALL INJECTORS STOP in the PGM-FI Function Test with the HDS.

ALL INJECTORS STOP

With the transmission in P or N position/mode, and with brake pedal pressed, turn the vehicle to the START mode to crank the engine.

Did the starter crank the engine?

YES

Select ECU reset in the PGM-FI system Test Mode Menu to cancel ALL INJECTORS STOP with the HDS.

NO

Go to step 3.
Starting system check 2
-1. Turn the vehicle to the OFF (LOCK) mode.

-2. Check the 12 volt battery condition . Check the electrical connections at the 12 volt battery, the 12 volt battery negative cable to the body, the engine ground cables, and the starter for looseness and corrosion. Then try starting the engine again.

Did the starter crank the engine?

Starter cranks normally

Repairing the loose connection corrected the problem. Select ECU reset in the PGM-FI system Test Mode Menu to cancel ALL INJECTORS STOP with the HDS.

Starter does not crank engine at all

If the starter does not crank the engine at all, go to step 4.

Starter cranks abnormally

If the starter cranks the engine erratically or too slowly, go to step 6.

Starter overruns

If the starter does not disengage from the torque converter ring gear when you release the button, remove the starter , and check for damaged the torque converter ring gear.
Fuse check:
Check the following fuses.
- No. A3-3 fuse
- No. A43 fuse
Are the fuses OK?

YES

Reinstall the fuses, then go to step 5.

NO

Replace the fuse(s), and recheck. If the fuse(s) blows again, repair the short to ground on the No. A3-3 and/or the No. A43 fuse circuit(s).

Determine possible failure area (starter, others)

-1. Make sure the transmission is in P or N position/mode.

-2. Disconnect the following connector.

Starter S terminal 1P connector

-3. Connect terminals A and B with a jumper wire.

Terminal A	Starter S terminal 1P connector (male terminals) No. 1:
Terminal B	12 volt battery positive terminal:

Courtesy of HONDA, U.S.A., INC.

Courtesy of HONDA, U.S.A., INC.

Did the starter crank the engine?

YES

Check the following items in the order listed until you find the problem in the circuit:

Check for a faulty engine start/stop switch .
Check for a faulty brake pedal position switch .
Check for a faulty relay circuit board .
Check for a faulty transmission range switch .
Check for an open or short in the wire and connectors between the under-hood fuse/relay box and the relay circuit board.
Check for an open or short in the wire and connectors between the relay circuit board and the PCM.
Check for an open or short in the wire and connectors between the relay circuit board and the starter.
Check for an open or short in the wire and connectors between the body control module and the PCM (STS line).
Check for an open or short in the wire and connectors between the relay circuit board and the brake pedal position switch.
Check for an open or short in the wire and connectors between the brake pedal position switch, the body control module, and the PCM.
Check for an open or short in the wire and connectors between the transmission range switch, the body control module, and the TCM.
Check for an open or short in the wire and connectors between the transmission range switch and the TCM.
Check for poor connections or loose terminals at the transmission range switch and body ground G201.

Check for an open or short in the wire and connectors between the 12 volt battery and the starter. Test or replace the starter , as necessary.

NOTE: Do not inspect the component parts inside the starter if disassembly is prohibited.

Starter test

-1. Test the starter with the Honda GR8 battery diagnostic station with AST module (12 volt), check the cranking voltage and the current draw from the following service limit table.

NOTE: For setup, customization, and other available features, refer to the GR8 user's manual.

Voltage (V)	Current (A)
8.5 or more	380 or less

Are the cranking voltage and the current draw within the service limits?

YES

Remove the starter , and inspect its drive gear and the torque converter ring gear for damage. Replace any damaged parts.

Check the starter and check for excessive drag in the engine.