P1609

DTC P1609: Battery Current Sensor Range/Performance














CIRCUIT OPERATION

- A 5-volt voltage is supplied to the battery current sensor power terminal (terminal No. 1) from the ECM (terminal No. 99). The ground terminal (terminal No. 3) is grounded with ECM (terminal No. 101).

- A voltage that is proportional to the battery current is sent to the ECM (terminal No. 100) from the battery current sensor output terminal (terminal No. 4).

TECHNICAL DESCRIPTION

- The battery current sensor outputs a voltage which corresponds to the battery current.

- The ECM checks whether this voltage is within a specified range.

DESCRIPTIONS OF MONITOR METHODS

Check whether the battery current sensor output voltage changes or not during the engine running.

DTC SET CONDITIONS

Check Condition

- Engine speed is more than 200 r/min.
Judgement Criterion

- When there is no change in battery current sensor output voltage.

FAIL-SAFE AND BACKUP FUNCTION

- Prohibits generator output suppression control against current consumers. (Operates as a normal generator.)

TROUBLESHOOTING HINTS (The most likely causes for this code to be set are:)

- Battery current sensor failed.

- Harness damage.

- Connector damage.

- ECM failed.

DIAGNOSIS

Required Special Tools:

- MB991958: Scan Tool (M.U.T.-III Sub Assembly)
- MB991824: V.C.I.

- MB991827: USB Cable

- MB991910: Main Harness A

- MB992110: Power Plant ECU Check Harness

STEP 1. Check battery itself

- Check battery itself Battery Check).

Q. Is the check result normal?

YES Go to Step 2.
NO Repair. Then go to Step 9.
STEP 2. Check battery test

- Check battery test Battery Test).

Q. Is the check result normal?

YES Go to Step 3.
NO Replace the battery. Then go to Step 9.
STEP 3. Check battery current sensor itself

- Check battery current sensor itself Component Tests and General Diagnostics).

Q. Is the check result normal?

YES Go to Step 4.
NO Replace the battery current sensor. Then go to Step 9.
STEP 4. Check harness connector A-64 at battery current sensor and harness connector B-109 at ECM for damage.

Q. Are the harness connectors in good condition?

YES Go to Step 5.
NO Repair or replace them. Harness Connector Inspection.
Then go to Step 9.
STEP 5. Check for harness damage between battery current sensor connector A-64 (terminal No. 1) and ECM connector B-109 (terminal No. 99).

Q. Is the harness wire in good condition?

YES Go to Step 6.
NO Repair it. Then go to Step 9.
STEP 6. Check for harness damage between battery current sensor connector A-64 (terminal No. 3) and ECM connector B-109 (terminal No. 101).

Q. Is the harness wire in good condition?

YES Go to Step 7.
NO Repair it. Then go to Step 9.
STEP 7. Check for harness damage between battery current sensor connector A-64 (terminal No. 4) and ECM connector B-109 (terminal No. 100).

Q. Is the harness wire in good condition?

YES Go to Step 8.
NO Repair it. Then go to Step 9.
STEP 8. Using scan tool MB991958, read the diagnostic trouble code
(DTC).





(1)Connect scan tool MB991958 to the data link connector.
(2)Start the engine and run at idle.
(3)After the DTC has been deleted, read the DTC again.
(4)Turn the ignition switch to the "LOCK" (OFF) position.

Q. Is the DTC P1609 set?

YES Replace the ECM (Refer to, Removal and Installation Removal and Replacement).
Then go to Step 9.

NO It can be assumed that this malfunction is intermittent. How to Cope With Intermittent Malfunctions.

STEP 9. Using scan tool MB991958, read the diagnostic trouble code
(DTC).

(1)Connect scan tool MB991958 to the data link connector.

(2)Start the engine and run at idle.

(3)After the DTC has been deleted, read the DTC again.

(4)Turn the ignition switch to the "LOCK" (OFF) position.

Q. Is the DTC P1609 set?

YES Retry the troubleshooting.
NO The inspection is complete.