Follow us on Twitter and win Autohex II Scan Tool for Kia and Hyundai (worth 945.00 USD)
P1640 Main Relay Control Circuit Malfunction
AutoHex Online Help: Hyundai TERRACAN(HP) 2003
TROUBLESHOOTING FOR DTC
DTC | P1640 | Main Relay Circuit Malfunction |
CC-CODE | 0a | Open circuit or short circuit to ground |
0b | Short circuit to battery line |
The charging system includes a battery, generator with a built in regulator, the charging indicator light, and connecting wiring. The generator uses diodes to rectify alternating current (AC) to direct current (DC). The ECM provides ground to one side of coil of main relay and the other side is connected to battery. The ECM monitors battery voltage and the voltage after main relay.
DTC DETECTING CONDITIONCC-CODE | Detecting Condition | Suspect Area |
0a | Open or short to ground in main relay circuit
| Open or short in Main Relay cirucit Main Relay ECM
|
0b | Short to battery line in main relay circuit
|
[SCHEMATIC DIAGRAM]
INSPECTION PROCEDURE