ENGINE DTC DESCRIPTION CAUSE DIAGNOSTIC LAMP (MIL) DIAGNOSTIC LAMP (CEL) Gil When Driven In CNG PROBABLE TROUBLE AREA P1640 CNG Tank Valve 1 Open / Short circuit to battery Open Circuit Short to battery OFF ON ON valves to ECU pin 156) 5) Check for back out of pins at both Actuator connector and ECU connector. 6) Check for damage of pins at both Actuator connector and ECU connector. 7) Faulty CNG Tank Valves. 8) Faulty ECU P1641 CNG Tank Valve 2 Short circuit to Ground Short to Ground OFF ON ON P1642 CNG Tank Valve 2 Open / Short circuit to battery Open Circuit Short to battery OFF ON ON P1643 CNG Pressure Regulator Shut Off Valve Open / Short circuit to battery Open Circuit Short to battery OFF ON OFF 1) Loose/ Damaged Connections or Intermittent fault. 2) Actuator supply line Short circuit to Battery/ Ground. 3) Actuator Signal line Short circuit to Battery/ Actuator Supply/Ground. 4) Check the continuity from Actuator connector pins to the ECU pins.(CNG pressure regulator pin 2 to ECU pin 240 & regulator pin 1 to ECU pin 156) 5) Check for back out of pins at both Actuator connector and ECU connector. 6) Check for damage of pins at both Actuator connector and ECU connector. 7) Faulty High Pressure regulator. 8) Faulty ECU P1644 CNG Pressure Regulator Shut off Valve short to Ground error Short to Ground OFF ON OFF P2187 More air quantity or less fuel quantity at idle – Gasoline Mode Injector delay time incorrect /Air intake leakage/MAP sensor offset incorrect. OFF ON ON 1. Blocked fuel line 2.Bad fuel regulator 3. Blocked/leaking injectors 4.Injector delay time not correct 5.Air leakage through intake P2188 Less air quantity or more fuel quantity at idle – Gasoline Mode ---- OFF ON ON P2279 Intake air leakage Crack in the manifold, canister purge hose removed OFF ON ON 1. Damaged inlet manifold 2. Canister purge hose removed/damaged
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