On-Board Diagnostics With NGS

These tests can be used to diagnose the Powertrain Control Module (PCM), sensors, solenoids, and actuators of the transmission.

The following is a guide for using the OBD Quick Tests and NGS Tester.

QUICK TEST 1.0 - VISUAL INSPECTION
Perform the Visual Check and Vehicle Preparation procedures as outlined in Powertrain Management.

Inspect the following:
- Air cleaner and inlet ducts.
- Engine vacuum hoses for damage such as leaks, cracks, blockage, proper routing, etc.
- Powertrain Control Module (PCM) system wiring harnesses for proper connections, bent or broken pins, corrosion, loose wires, proper routing, etc.
- PCM, sensors and actuators for physical damage.
- Engine coolant for proper level.
- Transmission fluid for proper level and condition.
- Non-factory installed items wired into the transmission or PCM harnesses.

Perform all necessary repairs before continuing with Quick Tests.

QUICK TEST 2.0 - SETUP
Connect New Generation Star (NGS) Tester to the Data Link Connector (DLC).
Prepare the vehicle and NGS Tester to run the On-Board Diagnostic (OBD) II procedures.
- Place the gearshift lever in the PARK position.
- The engine is at operating temperature.
- Apply the parking brake.
- Block the wheels.
- Turn the ignition switch to the OFF position.
- Verify that the proper program card is inserted in NGS Tester.
- Connect J1962/16-way DCL cable adapter to NGS Tester.
- Connect NGS Tester DCL cable adapter securely into the vehicle DCL.
- Turn the ignition switch to the ON position or start vehicle if necessary.

NOTE: If NGS Tester does not communicate with the Powertrain Control Module (PCM).

NGS Tester is ready to communicate with the PCM.

QUICK TEST 3.0 - KEY ON, ENGINE OFF (KOEO)

CAUTION: Do not replace parts based on a Diagnostic Trouble Code (DTC); perform pinpoint tests first to avoid replacing unnecessary parts and reduce costs.

Some special considerations for Key On, Engine Off (KOEO) Quick Test include the following:
- The KOEO Quick Test provides Diagnostic Trouble Codes (DTCs) present at the time of testing.
- Always diagnose DTCs first before any repair and/or replace components or circuits.

Perform visual inspection and vehicle preparation as required; refer to Quick Test 1.0 for visual inspection and Quick Test 2.0 for vehicle and New Generation Star (NGS) setup.
- Select VEHICLE AND ENGINE SELECTION menu.
- Select year, engine, or model with the appropriate qualifier if needed (for example, transmission or 49 state or California).
- Select DIAGNOSTIC DATA LINK menu.
- Select DIAGNOSTIC TEST MODE menu.
- Select KOEO ON-DEMAND SELF-TEST.
- Follow operating instructions from the NGS Tester menu screen.
- Record all DTCs displayed.
- Diagnose non-transmission DTCs first because they can directly affect the operation of the transmission. Road test the vehicle and repeat Quick Test 3.0 to verify the results.

QUICK TEST 4.0 - CONTINUOUS MEMORY CODES
Continuous Diagnostic Trouble Codes (DTCs) are concerns which were detected during normal vehicle operation. These DTCs are retained for 40 warm-up cycles.
Some special considerations for Key On, Engine Off (KOEO) Quick Test include the following:
- The cause of some continuous DTCs may have been eliminated if KOEO and/or Key On, Engine Running (KOER) DTCs were repaired. Always retest and repair any DTCs that still remain.
- If DTCs are present, go to Diagnostic Trouble Code Description Chart for repair information. Erase the DTC, perform the Transmission Drive Cycle Test, and repeat all Quick Test procedures after completing repairs on the DTCs.
- If the continuous memory DTCs test passes and a concern is still present, refer to Diagnosis by Symptom and TSBs for the concern diagnosis.

To perform continuous DTCs test:
- Select VEHICLE AND ENGINE SELECTION menu.
- Select year, engine, or model with the appropriate qualifier if needed (for example, transmission or 49 state or California).
- Select DIAGNOSTIC DATA LINK menu.
- Select DIAGNOSTIC TEST MODES menu.
- Select RETRIEVE/CLEAR CONTINUOUS DTCs menu.
- Follow operating instructions from New Generation Star (NGS) Tester menu screen.
- Record all DTCs displayed.
- Perform Transmission Drive Cycle Test.
- Rerun Continuous Memory Codes Test. If DTCs have returned, repair as required. Road test and rerun all Continuous Memory Codes Test procedures.

QUICK TEST 5.0 - KEY ON, ENGINE RUNNING (KOER)
This test provides "hard" Diagnostic Trouble Codes (DTCs) only.
- Follow the menu screen instructions as they appear.
- If a DTC appears after Quick Test 5.0 - Key On, Engine Running (KOER) Test, a malfunction is present; refer to the Diagnostic Trouble Code Description Chart.

Perform a visual inspection and vehicle preparation as required.
- Select VEHICLE AND ENGINE SELECTION menu.
- Select year, engine, or model with the appropriate qualifier if needed (for example, transmission or 49 state or California).
- Select DIAGNOSTIC DATA LINK menu.
- Select DIAGNOSTIC TEST MODE menu.
- Select KOER ON-DEMAND SELF-TEST.
- Follow the operating instructions from New Generation Star (NGS) Tester menu screen (example: turn key on, etc.). Perform brake on/off and cycle the Transmission Control Switch (TCS) on and off, if equipped.
- Record all DTCs displayed.
- Repair all non-transmission DTCs first because they can directly affect the operation of the transmission. Road test the vehicle and repeat the Quick Test 5.0 to verify the repair.

SPECIAL TEST MODES - OUTPUT TEST MODE

CAUTION: Safety must be observed when using the output test mode. When all outputs are on and the electric fuel pump is energized, make sure the fuel system is intact and is not being repaired at that time. When low speed or high speed cooling fans are turned on, make sure fan blades are clear of any obstruction to avoid fuel leaking or damages to the components.

NOTE: As a safety precaution, the OTM will default to its normal state after ten minutes, after the vehicle is started, or after cycling the ignition switch OFF and ON.

The OTM aids in repairing output actuators associated with the Powertrain Control Module (PCM). It allows the technician to energize and de-energize most of the system output actuators on command. When entering OTM, the outputs can be turned off and on without controlling the cooling fans. The low and high speed cooling fans may be turned on separately without energizing the other outputs.
Enter OTM with ignition key ON and the engine OFF.
- Perform the necessary vehicle preparation and visual inspection.
- Connect New Generation Star (NGS) Tester to Data Link Connector (DLC).
- Select VEHICLE & ENGINE SELECTION menu.
- Select NEW VEHICLE YEAR & MODEL.
- Enter year, engine, or model with the appropriate qualifier, if needed (i.e., transmission, 49 State or California).
- Select DIAGNOSTIC DATA LINK.
- Select PCM - POWERTRAIN CONTROL MODULE.
- Select ACTIVE COMMAND MODES.
- Select OUTPUT TEST MODE.
- Turn key ON.
- Follow the operating instructions from the menu.
- Select the mode (i.e., ALL ON, ALL OFF, HIGH SPEED FAN or LOW SPEED FAN).
- Select START to turn outputs on (may link up to Parameter Identification Indices (PIDs)).
- Select STOP to turn outputs off.

PCM RESET MODE
The Powertrain Control Module (PCM) Reset Mode permits New Generation Star (NGS) Tester to command the PCM to clear all Diagnostic Trouble Codes (DTCs). When resetting the PCM, DTC P1000 will be set in the PCM until all On-Board Diagnostic (OBD) II system or components have been monitored during OBD II Drive Cycle.
A PCM reset:
- Clears the DTCs.
- Clears the freeze frame data.
- Clears the oxygen sensor test data.
- Resets the status of the OBD II system monitors.
- Sets the DTC P1000.

Perform a visual inspection and vehicle preparation as required.
- Select VEHICLE AND ENGINE SELECTION menu.
- Select year, engine, or model with the appropriate qualifier if needed (i.e., transmission, 49 state or California).
- Select GENERIC OBD II FUNCTIONS menu.
- Select CLEARING DIAGNOSTIC CODES.
- Follow operating instructions from NGS Tester menu screen.