Engine Controls - Tests W/codes: Adjustments Dodge Ram Wagon B1500

NTC-6A: CHECKING ECT SENSOR CALIBRATION

1. Turn ignition on, with engine off. Using scan tool, read Engine Coolant Temperature (ECT) sensor value. If engine coolant temperature is more than 180°F (82.2°C), allow engine coolant temperature to cool down to 150°F (65.6°C) before proceeding. If engine coolant temperature is 150°F (65.6°C) or less, start engine and monitor scan tool until engine coolant temperature reaches 180°F (82.2°C). If ECT sensor value increases smoothly, go to next step. If ECT sensor value increase is erratic, check for cooling system problems and replace ECT sensor. Perform TEST VER-2A.
2. If coolant temperature reaches 180°F (82.2°C) or more, test is complete. If coolant temperature does not reach 180°F (82.2°C) or more, check for cooling system problems and replace ECT sensor. Perform TEST VER-2A.

NTC-6B: CHECKING ECT SENSOR CALIBRATION

Turn ignition on, with engine off. Using scan tool, read Engine Coolant Temperature (ECT) sensor value. If engine coolant temperature is more than 180°F (82.2°C), allow engine coolant temperature to cool down to 150°F (65.6°C) before proceeding. If engine coolant temperature is 150°F (65.6°C) or less, start engine and monitor scan tool until engine coolant temperature reaches 180°F (82.2°C). If coolant temperature reaches 180°F (82.2°C) or more, test is complete. If coolant temperature does not reach 180°F (82.2°C) or more, check for cooling system problems and replace ECT sensor.

NTC-7A: CHECKING TP SENSOR CALIBRATION

1. Start engine and allow it to idle. Using scan tool, monitor engine speed (RPM) while wiggling Throttle Position (TP) sensor connector and wiring harness. TP sensor is located on throttle body. If RPM changes while wiggling connector and wiring harness, repair connector and wiring harness where wiggling caused RPM to change. Perform TEST VER-2A. If RPM does not change while wiggling connector and wiring harness, go to next step.
2. Turn engine off. Turn ignition on, with engine off. Using scan tool, monitor TP sensor voltage while wiggling TP sensor connector and wiring harness. If TP sensor voltage changes while wiggling connector and wiring harness, repair connector and wiring harness where wiggling caused TP sensor voltage to change. Perform TEST VER-2A. If TP sensor voltage does not change while wiggling connector and wiring harness, go to next step.
3. Turn ignition off. Visually inspect related connectors and wiring harness. Repair connectors and wiring harness as necessary. Perform TEST VER-2A. If connectors and wiring harness are okay, go to next step.
4. Turn ignition on with engine off. Using scan tool, monitor TPS voltage while slowly moving throttle from closed position to fully open position. If TPS voltage changes smoothly, go to next step. If TPS voltage does not change smoothly, replace TPS. Perform TEST VER-2A.
5. Ensure ignition is on, with engine off. Close throttle. Ensure throttle is fully closed and against throttle stop. Using scan tool, read TPS voltage with throttle fully closed. If TPS voltage is 1.5 volts or more, replace TPS. Perform TEST VER-2A. If TPS voltage is less than specified, go to next step.
6. Ensure ignition is on, with engine off. Close throttle. Ensure throttle is fully closed and against throttle stop. Using scan tool, read TPS voltage with throttle fully closed. If TPS voltage is 1.5 volts or more, replace TPS. Perform TEST VER-2A. If TPS voltage is less than specified test is complete.

NTC-7B: CHECKING APPS CALIBRATION

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For circuit identification and wiring diagram, see RAM VAN & RAM WAGON wiring diagram in WIRING DIAGRAMS article.

1. Turn ignition off. Ensure Accelerator Pedal Position Sensor (APPS) and Engine Control Module (ECM) are correctly wired. Rewire miswired connector(s) as necessary. If connectors are correctly wired, go to next step.
2. Turn ignition on, with engine off. Using scan tool, select SENSORS. Monitor APPS voltage while moving throttle lever between upper and lower stops. If voltage varies between one volt with throttle closed and 3 volts with throttle open, test is complete. If voltage does not vary as specified, go to next step.
3. Ensure ignition is on, with engine off. Ensure throttle pedal moves freely between upper and lower stops. If throttle pedal moves freely, go to next step. If throttle pedal does not move freely, repair as necessary.
4. At this time, APPS is assumed to be defective. Replace APPS.

NTC-8A: CHECKING MAP SENSOR CALIBRATION

Turn ignition off. Install vacuum "T" fitting and vacuum gauge at vacuum source on intake manifold. Start engine and allow engine to idle. If engine will not idle, maintain a constant RPM above idle. Note engine vacuum on vacuum gauge. Using scan tool, read MAP sensor vacuum. If MAP sensor vacuum is within one in. Hg of engine vacuum on vacuum gauge, MAP sensor is operating properly. Test is complete. If MAP sensor vacuum is not within one in. Hg of engine vacuum on vacuum gauge, replace MAP sensor. Perform TEST VER-2A.

NTC-8B: CHECKING MAP SENSOR CALIBRATION

Turn ignition off. Install vacuum "T" fitting and pressure gauge at manifold pressure source. Start engine and allow engine to idle. If engine will not idle, maintain a constant RPM above idle. Note engine pressure on pressure gauge. Using scan tool, read MAP sensor pressure. If MAP sensor pressure is within one inch of engine pressure on pressure gauge, MAP sensor is operating properly. Test is complete. If MAP sensor pressure is not within one inch of engine pressure on pressure gauge, replace MAP sensor.