ENGINE DTC DESCRIPTION CAUSE DIAGNOSTIC LAMP (MIL) DIAGNOSTIC LAMP (CEL) Gil When Driven In CNG PROBABLE TROUBLE AREA P0650 Check MIL Lamp open/short circuit error Open/short circuit Error OFF ON ON 1. Loose or damaged connections. P0652 Sensor 2 (MAP sensor) Reference voltage supply short to ground Short Circuit to Ground ON OFF ON 1) Loose/ Damaged Connections. 2) Faulty Sensor. 3) Faulty ECU. P0653 Sensor 2 (MAP sensor) Reference voltage supply short to battery Short Circuit to Battery ON OFF ON P0686 Main relay response slow Sticky main relay OFF ON ON 1. Check relay control pin short to ground 2. Check Main relay P0691 Radiator Fan short to ground Short Circuit to Ground OFF ON (Blinking) ON 1) Loose/ Damaged Connections. 2) Relay supply line Short circuit to Battery/ Ground. 3) Relay Control line Short circuit to Battery/ Ground. 4) Check the continuity from Radiator Fan Relay connector pin to the ECU pin 141. 5) Check for back out of pins at ECU connector. 6) Faulty Radiator Fan Relay. 7) Faulty ECU P0692 Radiator Fan short to battery Short Circuit to Battery OFF ON (Blinking) ON P0695 Condenser Fan short to ground Short Circuit to Ground OFF OFF ON 1) Loose/ Damaged Connections. 2) Relay supply line Short circuit to Battery/ Ground. 3) Relay Control line Short circuit to Battery/ Ground. 4) Check the continuity from Condenser Fan Relay connector pin to the ECU pin 140. 5) Check for back out of pins at ECU connector. 6) Faulty Condenser Fan Relay. 7) Faulty ECU P0696 Condenser Fan short to battery Short Circuit to Battery OFF OFF ON P1093 Fuel System Leak detected( Large Leak ) Leakage on Low Pressure side OFF ON (Blinking) ON 1)CNG Pressure in the Rail, drops too quickly 2) Faulty Pressure Regulator 3) Faulty or Leaky Injector. 4) Check Hose connection between PR Valve and Rail.
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