P1550

P1550 BATTERY CURRENT SENSOR





DTC Logic

DTC DETECTION LOGIC






DTC CONFIRMATION PROCEDURE
1.PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always perform the following procedure before conducting the next test.
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds.
TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is more than 8 V at idle.
- GO TO 2.
2.PERFORM DTC CONFIRMATION PROCEDURE
1. Start engine and wait at least 10 seconds.
2. Check 1st trip DTC.
Is 1st trip DTC detected?
YES - Go to SEE Diagnosis Procedure.
NO - INSPECTION END




Diagnosis Procedure
1.CHECK GROUND CONNECTION
1. Turn ignition switch OFF.
2. Check ground connection M95. Refer to Ground Inspection in Circuit Inspection.
Is the inspection result normal?
YES - GO TO 2.
NO - Repair or replace ground connection.
2.CHECK BATTERY CURRENT SENSOR POWER SUPPLY CIRCUIT-I
1. Disconnect battery current sensor harness connector.
2. Turn ignition switch ON.
3. Check the voltage between battery current sensor harness connector and ground.





Is the inspection result normal?
YES - GO TO 9.
NO - GO TO 3.
3.CHECK BATTERY CURRENT SENSOR POWER SUPPLY CIRCUIT-II
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check the continuity between battery current sensor harness connector and ECM harness connector.





Is the inspection result normal?
YES - GO TO 5.
NO - GO TO 4.
4.DETECT MALFUNCTIONING PART
Check the following.
- Harness connectors F40, E20
- Harness for open between battery current sensor and ECM
- Repair open circuit.
5.CHECK SENSOR POWER SUPPLY CIRCUIT
Check harness for short to power and short to ground, between the following terminals.





Is the inspection result normal?
YES - GO TO 6.
NO - Repair short to ground or short to power in harness or connectors.
6.CHECK COMPONENTS
Check the following.
- Crankshaft position sensor (POS) ( P0335.)
- Camshaft position sensor (PHASE) (bank 2) ( P0340.)
- EVAP control system pressure sensor ( P0451.)
- Refrigerant pressure sensor ( Testing and Inspection.)
Is the inspection result normal?
YES - GO TO 7.
NO - Replace malfunctioning component.
7.CHECK APP SENSOR
SEE Component Inspection.
Is the inspection result normal?
YES - GO TO 14.
NO - GO TO 8.
8.REPLACE ACCELERATOR PEDAL ASSEMBLY
1. Replace accelerator pedal assembly.
2. Go to P2122.
- INSPECTION END
9.CHECK BATTERY CURRENT SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check the continuity between battery current sensor harness connector and ECM harness connector.





4. Also check harness for short to ground and short to power.
Is the inspection result normal?
YES - GO TO 11.
NO - GO TO 10.
10.DETECT MALFUNCTIONING PART
Check the following.
- Harness connectors E20, F40
- Harness for open or short between battery current sensor and ECM
- Repair open circuit, short to ground or short to power in harness or connectors.
11.CHECK BATTERY CURRENT SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Check the continuity between battery current sensor harness connector and ECM harness connector.





2. Also check harness for short to ground and short to power.
Is the inspection result normal?
YES - GO TO 13.
NO - GO TO 12.
12.DETECT MALFUNCTIONING PART
Check the following.
- Harness connectors E20, F40
- Harness for open or short between battery current sensor and ECM
- Repair open circuit, short to ground or short to power in harness or connectors.
13.CHECK BATTERY CURRENT SENSOR
SEE Component Inspection.
Is the inspection result normal?
YES - GO TO 14.
NO - Replace battery negative cable assembly.
14.CHECK INTERMITTENT INCIDENT
Intermittent Incident.
- INSPECTION END




Component Inspection
1.CHECK BATTERY CURRENT SENSOR
1. Turn ignition switch OFF.
2. Reconnect harness connectors disconnected.
3. Disconnect battery negative cable (1).

Arrow :To body ground





4. Install jumper cable (A) between battery negative terminal and body ground.
5. Turn ignition switch ON.
6. Check the voltage between ECM harness connector terminals as per the following.





Is the inspection result normal?
YES - INSPECTION END
NO - Replace battery negative cable assembly.