Chart 8

Lack/Loss of Power

NOTE: Verify the symptom is reported under normal driving conditions without excessive engine/vehicle load. Also, be aware of the engine RPM/speed limiting functions of the PCM.

NOTE: For applications with a knock sensor (KS), a lack of power may result when the vehicle is operated with a breakout box installed at the PCM. The KS circuits are not shielded in the breakout box, and KS signal noise may be noticed by the PCM. If this happens, spark timing will be retarded and a lack of power may result.

SYSTEM/COMPONENT	REFERENCE ( PINPOINT TEST - GASOLINE MODELS unless noted)
Automatic Transmission Fluid Throttle Linkage Air cleaner element	Visual
Check the following PIDS: DPFEGR (if equipped) (hot idle value within 0.15 volt of KOEO value) LONGFT1/LONGFT2 (value between -20 and +20%) For vehicles equipped with IMTV: IMTVF for both KOEO and KOER, with the transmission in PARK/NEUTRAL and the engine RPM greater than 3,000 RPM, the PID should indicate no fault (or NO) in both situations.	DPFEGR PID value not within 0.15 volt of KOEO value: For vehicles equipped with ESM EGR: GO to H: Exhaust Gas Recirculation System Module (ESM) STEP HH27. All others: GO to E: Exhaust Gas Recirculation (EGR) Systems STEP HE57.
	LONGFT1/LONGFT2 value low (-): Continue diagnosis. Concentrate checks in areas that would cause the engine to run rich.
	LONGFT1/LONGFT2 value high (+): Continue diagnosis. Concentrate checks in areas that would cause the engine to run lean. IMTVF PID indicates a fault: GO to U: Intake Air Systems STEP HU41.
Fuel Delivery System	GO to PINPOINT TEST HC .
Secondary Ignition	For vehicles equipped with a coil pack ignition system, GO to PINPOINT TEST JC . For all others, GO to PINPOINT TEST JB .
Mass Air Flow (MAF) Sensor	GO to C: Mass Air Flow (MAF) Sensor STEP DC26.
Exhaust System	GO to F: Catalyst Efficiency Monitor and Exhaust Systems STEP HF8.
Base Engine	REFER to ENGINE .
Automatic Transmission	REFER to AUTOMATIC TRANSMISSION/TRANSAXLE .
Brake System (brake drag or binding)	REFER to BRAKE SYSTEM - GENERAL INFORMATION .
Supercharged applications: Supercharger Bypass System	GO to J: Supercharger Bypass Control STEP KJ11.
Additional Testing	GO to PINPOINT TEST Z .
Additional Checks: NOTE: Some applications have a PID that indicates whether the PCM is reducing torque (TQ_CNTL) (#095E b0), and if so, why the torque is being reduced (#095Eb1-13) (0 equals No torque reduction requested; 1 equals Torque Truncation. Cuts fuel to protect when the line pressure falls to a minimum limit; 2 equals Traction Control Event. Cuts fuel/spark for traction control; 3 equals Vehicle Speed Limit. Cuts fuel). Customer driving habits Correct PCM vehicle identification (VID) block information. REFER to FLASH ELECTRICALLY ERASABLE PROGRAMMABLE READ ONLY MEMORY (EEPROM) . IMRC linkage (if equipped) Clutch (M/T) Charging system Engine RPM/speed limiting functions of the PCM (look for incorrect high vehicle speed signal from ABS, VSS, or OSS)	Visual. REFER to the applicable service information article.