Page 1 of 7 2004 PCED Gasoline Engines SECTION 5: Pinpoint Tests Procedure revision date: 05/08/2007 DM: Manifold Absolute Pressure () and Thermal Manifold Absolute Pressure (T) Sensor DM: Introduction DM1 DETERMINE THE COMPONENT TYPE Is the vehicle equipped with an EGR System Module (ESM) type EGR? GO to DM2. GO to DM20. DM2 MONITOR THE _V PID Perform the KOER self-test. Is the voltage between 0.05-4.95 V? VERIFY the PCM is at the latest at the latest calibration level. REPROGRAM if necessary. Otherwise, the fault is not present at this time. GO to DM3. DM3 VERIFY HARNESS AND CONNECTOR INTEGRITY Perform a thorough visual inspection of the connector, pins and the wires attaching to the pins. Are there any concerns with the wiring or the ESM connection? REPAIR as necessary. GO to DM4. DM4 MONITOR THE _V PID ESM connector connected. Perform the KOEO self-test. Is the voltage between 0.05-4.95 V? The fault is not present at this time. GO to DM5. DM5 DETERMINE THE PRESENT _V PID VOLTAGE Is the voltage less than 0.05 V? GO to DM6. GO to DM9. DM6 KOEO AND KOER DTC P0107: CHECK THE VOLTAGE BETWEEN THE AND AT THE ESM SENSOR

Page 2 of 7 - Pin 2 - Pin 6 Is the voltage between 4-5.5 V? GO to DM7. GO to C1. DM7 CHECK THE CIRCUIT FOR A SHORT TO AND GND IN THE HARNESS ( + ) ESM Connector, Harness Side ( - ) - Pin 3 Ground - Pin 3 - Pin 6 Is the resistance greater than 10K ohms? GO to DM8. DM8 INDUCE THE OPPOSITE SENSOR VOLTAGE PCM connector connected. Point A ESM Connector, Harness Side Point B ESM Connector, Harness Side - Pin 3 - Pin 2 Is the voltage greater than 4.6 V? INSTALL a new ESM. Clear the PCM DTCs. REPEAT the self-test. INSTALL a new PCM. (refer to Section 2, Flash Electrically Erasable Programmable Read Only Memory (EEPROM)). DM9 KOEO AND KOER DTC P0108: CHECK THE VOLTAGE BETWEEN THE AND AT THE ESM SENSOR - Pin 2 - Pin 6 Is the voltage between 4-5.5 V? GO to DM10. GO to C1. DM10 CHECK THE AND CIRCUIT(S) FOR AN OPEN IN THE HARNESS

Page 3 of 7 ( + ) PCM Connector, Harness Side ( - ) ESM Connector, Harness Side - Pin 3 - Pin 6 Are the resistances less than 5 ohms? GO to DM11. REPAIR the open circuit. DM11 CHECK THE CIRCUIT FOR A SHORT TO IN THE HARNESS - Pin 3 - Pin 2 Is the resistance greater than 10K ohms? GO to DM12. DM12 CHECK THE CIRCUIT FOR A SHORT TO VPWR IN THE HARNESS - Pin 3 VPWR - Pin 4 Is the resistance greater than 10K ohms? GO to DM13. DM13 INDUCE THE OPPOSITE SENSOR VOLTAGE PCM connector connected. Point A ESM Connector, Harness Side Point B ESM Connector, Harness Side - Pin 3 - Pin 6 Is the voltage less than 0.1 V? INSTALL a new ESM. Clear the PCM DTCs. REPEAT the self-test. INSTALL a new PCM. (refer to Section 2, Flash Electrically Erasable Programmable Read Only Memory (EEPROM)). DM14 DTCS P0107, P0108 AND P0109: CHECK THE CIRCUIT(S) FOR INTERMITTENT CONCERNS Perform a thorough wiggle test on the ESM harness. Lightly tap on the ESM to simulate road shock. Did a sudden change in voltage occur while monitoring the PID? ISOLATE the fault. REPAIR as necessary. Unable to duplicate or identify the fault at this time. GO to Z1.

Page 4 of 7 DM15 DTC P0106: RANGE/PERFORMANCE te: If DTC(s) P0107, P0108 or P0109 are present, diagnose those DTC(s) first. If any mass air flow (MAF) sensor related DTCs are present, diagnose those DTCs prior to diagnosing DTC P0106. Disregard any DTC(s) generated as a result of this test. Point A ESM Connector, Harness Side Point B ESM Connector, Component Side - Pin 2 - Pin 2 - Pin 6 - Pin 6 ( + ) ESM Connector, Component Side ( - ) Vehicle Battery - Pin 3 Negative terminal Is the voltage between 1-2 V? GO to DM19. GO to DM16. DM16 CHECK THE CIRCUIT FOR AN OPEN IN THE ESM HARNESS Remove the jumper wires. ( + ) PCM Connector, Harness Side ( - ) ESM Connector, Harness Side - Pin 3 Is the resistance less than 5 ohms? GO to DM17. REPAIR the open circuit. DM17 CHECK THE CIRCUIT FOR A SHORT IN THE ESM HARNESS - Pin 3 - Pin 6 - Pin 3 - Pin 2 - Pin 3 VPWR - Pin 4 Are the resistances greater than 10K ohms? GO to DM18. DM18 KOEO AND KOER VOLTAGE te: The PID should change by at least 1.5 volts from key on engine off to key on engine running. ESM connector connected. PCM connector connected. Record the KOEO voltage. Record the KOER voltage. Does the PID value change?

Page 5 of 7 GO to DM19. CHECK the hose for freezing or obstructions. If OK, INSTALL a new ESM. REFER to the Workshop Manual Section 303-08, Engine Emission Control. DM19 COMPARE ACTUAL VOLTAGE TO PID VOLTAGE Point A ESM Connector, Harness Side Point B ESM Connector, Component Side - Pin 2 - Pin 2 - Pin 6 - Pin 6 - Pin 3 - Pin 3 ( + ) ESM Connector, Harness Side ( - ) - Pin 3 Ground Record the actual voltage values at key on engine off, idle, 1,000 and 2,000 RPM. Record the PID voltage values at key on engine off, idle, 1,000 and 2,000 RPM. Does the PID voltage stay within 0.5 volt of the actual voltage? The concern is not present at this time. Carry out a visual inspection. Check for loose connections, and damaged or corroded pins. Wiggle the harness, attempting to recreate the concern. DM20 KOEO AND KOER DTCS P0107 AND P0108: CHECK THE VOLTAGE BETWEEN THE AND AT THE /T SENSOR /T Sensor connector disconnected. ( + ) /T Sensor Connector, Harness Side ( - ) /T Sensor Connector, Harness Side Is the voltage between 4-5.5 V? GO to DM21. GO to C1. DM21 CHECK THE /T SENSOR OPERATION Point A /T Sensor Connector, Component Side Point B /T Sensor Connector, Harness Side Briefly increase the engine RPM to 3000 then return to idle. Monitor the T voltage. ( + ) /T Sensor Connector, Harness Side ( - ) Vehicle Battery Negative terminal

Page 6 of 7 Did the voltage reading rapidly increase to greater than 2 volts then rapidly decrease to less than 1 volt? GO to DM22. INSTALL a new /T sensor. Clear the PCM DTCs. REPEAT the self-test. DM22 CHECK THE /T CIRCUIT FOR A SHORT TO AND IN THE HARNESS ( + ) /T Sensor Connector, Harness Side ( - ) /T Sensor Connector, Harness Side Are the resistances greater than 10K ohms? GO to DM23. DM23 CHECK THE /T CIRCUIT FOR AN OPEN IN THE HARNESS ( + ) PCM Connector, Harness Side ( - ) /T Sensor Connector, Harness Side Is the resistance less than 5 ohms? INSTALL a new PCM. (refer to Section 2, Flash Electrically Erasable Programmable Read Only Memory (EEPROM)). REPAIR the open circuit. DM24 DTCS P0107, P0108 AND P0109: CHECK THE /T CIRCUIT(S) FOR INTERMITTENT CONCERNS Perform a thorough wiggle test on the /T harness. Lightly tap on the /T to simulate road shock. Did a sudden change in voltage occur while monitoring the PID? ISOLATE the fault. REPAIR as necessary. Unable to duplicate or identify the fault at this time. GO to Z1. DM25 DTC P0106: /T RANGE/PERFORMANCE te: If DTC(s) P0107, P0108 or P0109 are present, diagnose those DTC(s) first. If any Mass Air Flow (MAF) sensor related DTCs are present, diagnose those DTCs prior to diagnosing DTC P0106. Disregard any DTC(s) generated as a result of this test. /T Sensor connector disconnected. Point A /T Sensor Connector, Harness Side Point B /T Sensor Connector, Component Side

Page 7 of 7 ( + ) /T Sensor Connector, Component Side ( - ) Vehicle Battery Negative terminal Is the voltage between 1-2 V? Record the actual /T voltage values at idle, 1,000 and 2,000 RPM. You will use the values for comparison in the following test step. GO to DM26. CHECK the /T harness for open and short circuits. DM26 COMPARE ACTUAL VOLTAGE TO _V PID VOLTAGE te the _V PID voltage. te the _V PID voltage. Increase engine speed to 1,000 RPM. te the _V PID voltage. Increase engine speed to 2,000 RPM. te the _V PID voltage. Does the _V PID voltage stay within 0.5 volt of the actual voltage? The fault is not present at this time. INSTALL a new /T sensor. Clear the PCM DTCs. REPEAT the self-test.