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Test T - Turbo Boost

NOTE: Turbo boost system is electrically protected by a fuse. Check fuse before proceeding with test.
  1. Code 67. Set octane switch in regular position, if equipped. Perform Key On-Engine Off Self-Test. If code 67 is present, go to next step. If no code 67, go to step 15).
  2. Turn ignition off and wait 10 seconds. Disconnect boost solenoid connector. With DVOM on 200 ohm scale, measure resistance of boost solenoid. If resistance is 1-2 ohms, go to next step. If less than 1 ohm or more than 2 ohms, replace solenoid and retest.
  3. Place octane switch in premium position. Turn ignition off and wait 10 seconds. Place DVOM on 20 volt scale. Enter Output State Check and perform Key On-Engine Off Self-Test until completion of Continuous Test Codes. DVOM will indicate zero volts. While observing DVOM, depress and release throttle. If DVOM reading indicated high voltage reading, remain in Output State Check and go to next step. If DVOM reading did not indicate high voltage reading, depress throttle to wide open position. If Self-Test Output voltage does not read high voltage, go to Test K, step 13). Leave equipment connected.
  4. Remain in Output State Check and turn ignition on. Place DVOM on 20 volt scale. Connect positive lead of DVOM to vehicle power circuit on rear of boost connector and negative lead to boost output circuit of boost connector. While observing DVOM, depress and release throttle to wide open position several times to cycle output on and off. If boost output does cycle on and off, go to step 21). If not, go to next step.
  5. Turn ignition on and set DVOM on 20 volt scale. Connect DVOM positive lead to rear of pin 2 of turbo boost control module harness connector and negative lead to rear of pin 3 of connector. While observing DVOM, depress and release throttle to wide open position several times. If boost output cycles on and off, go to step 8). If not, go to next step.
  6. Turn ignition off and wait 10 seconds. Disconnect 60-pin connector at ECA and inspect. Connect breakout box and reconnect ECA. Enter Output State Check and place DVOM on 20 volt scale. Connect positive lead to box pin 37 and negative lead to box pin 32. While observing DVOM, depress and release throttle to wide open position several times. If boost output cycles on and off, go to step 11). If not, go to next step.
  7. Turn ignition off and wait 10 seconds. Remove jumper wire from Self-Test Input and Signal Return circuits. Leave breakout box connected. With DVOM on 200,000 ohm scale, measure resistance from box pin 32 to box pins 37, 46 and 60 in turn. If any reading is less than 10,000 ohms, repair short and repeat Quick Test. If all readings are 10,000 ohms or more, replace ECA and repeat Quick Test.
  8. Turn ignition on. With DVOM on 20 volt scale, connect negative lead to rear of pin 1 on boost control module harness and positive lead to rear of pins 3 and then 5 of module harness. If voltage reading is 10.5 volts or more, go to next step. If less than 10.5 volts, repair open circuit and repeat Quick Test.
  9. Turn ignition off and wait 10 seconds. Place DVOM on 200 ohm scale. Measure resistance from rear of boost output circuit of solenoid connector to rear of pin 4 of module connector. Then from rear of vehicle power circuit of solenoid connector to rear of pin 5 of module connector. If both readings are less than 5 ohms, go to next step. If any reading is more than 5 ohms, repair open circuit and repeat Quick Test.
  10. Turn ignition off and wait 10 seconds. Place DVOM on 200,000 ohm scale. Disconnect harness at turbo boost control module and turbo boost solenoid. Measure resistance between pins 4 and 5 of turbo boost control module harness. If reading is 10,000 ohms or more, replace turbo boost control module and repeat Quick Test. If reading is less than 10,000 ohms, repair short and repeat Quick Test.
  11. Turn ignition off and wait 10 seconds. With breakout box installed and ECA connected, disconnect boost relay harness. With DVOM on 200 ohm scale, measure resistance from pin 4 of boost relay to box pin 32. If less than 5 ohms, go to next step. If more than 5 ohms, repair open and repeat Quick Test.
  12. Turn ignition off and wait 10 seconds. Disconnect boost control module. With DVOM on 200 ohm scale, measure resistance from pin 3 of boost relay to pin 2 of boost control module. If less than 5 ohms, go to next step. If 5 ohms or more, repair open and repeat Quick Test.
  13. Turn ignition off and wait 10 seconds. With breakout box installed, place DVOM on 200,000 ohm scale. Disconnect turbo boost control module and boost relay. Measure resistance from pin 3 of boost relay to box pins 37, 40 and 46 in turn. If any reading is less than 10,000 ohms, service short and repeat Quick Test. If all readings are 10,000 ohms or more, go to next step.
  14. Turn ignition on. Place octane switch in premium position, if equipped. With DVOM on 20 volt scale, connect positive lead to pin 2 and negative lead to pin 1 of turbo boost relay. If 10.5 volts or more, replace boost relay and repeat Quick Test. If less than 10.5 volts, repair open and repeat Quick Test.
  15. Turbo Octane Switch (2.3L Only). Turn ignition off and wait 10 seconds. Disconnect 60-pin connector at ECA and inspect. Connect breakout box and reconnect ECA. Place DVOM on 20 volt scale. Connect positive lead to box pin 30 and negative lead to box pin 46. Turn ignition on. While observing DVOM, cycle octane switch several times. If voltage changes from 0 to 5 volts, replace ECA and repeat Quick Test. If voltage does not change, go to next step.
  16. Turn ignition off and wait 10 seconds. With breakout box installed, place DVOM on 200 ohm scale. Measure resistance from box pin 30 and octane switch relay pin 3. If less than 5 ohms, go to next step. If 5 ohms or more, service open and repeat Quick Test.
  17. Turn ignition off and wait 10 seconds. Breakout box installed. With DVOM on 200 ohm scale, measure resistance from box pin 46 to octane switch relay pin 4. If less than 5 ohms, go to next step. If 5 ohms or more, service open and repeat Quick Test.
  18. Turn ignition on. Place DVOM on 20 volt scale and octane switch in premium position. Measure voltage between pins 1 and 2 on octane switch relay harness connector. If 10.5 volts or more, replace octane switch relay and repeat Quick Test. If less than 10.5 volts, go to next step.
  19. Turn ignition on. With DVOM on 200 ohm scale, measure resistance between pin 1 of octane switch relay to battery ground. If less than 5 ohms, go to next step. If 5 ohms or more, repair open and repeat Quick Test.
  20. Turn ignition on. Place DVOM on 20 volt scale. Connect positive lead to input of octane switch and negative lead to battery ground. If voltage is 10.5 volts or more, replace octane switch and repeat Quick Test. If less than 10.5 volts, repair open and repeat Quick Test.
  21. Remain in Output State Check. Place octane switch in premium position. Disconnect Black solenoid vacuum hose (not Blk/Yel Stripe hose) at turbocharger end and attach vacuum pump to hose. Depress throttle to wide open position 1 time to cycle solenoid to closed position. Apply vacuum. Depress throttle to wide open position 1 time to cycle solenoid to open position and release vacuum. If solenoid held and then released vacuum, EEC system is okay. Check boost system for malfunctions. If solenoid did not hold and then release vacuum, replace solenoid and retest.
Fig 1: Turbo Boost Circuit
G1299
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