Trouble Code Diagnostic Hints

WARNING: This page is about a different car, the 1994 Toyota Paseo. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: To determine a common cause for a trouble code to be set, see TROUBLE CODE DIAGNOSTIC HINTS table.

TROUBLE CODE DIAGNOSTIC HINTS ⁽¹⁾

Trouble Code

Diagnostic Hints

No "G", "G1", "G2" or "NE" Ignition Signal To ECM Within 2 Seconds After Engine Is Cranked, No "G" Ignition Signal To ECM For 3 Seconds With Engine Speed Of 600-4000 RPM Open In "G-" Ckt

No "NE" Ignition Signal To ECM When Engine Speed Is Greater Than Approximately 1000 RPM, No "G" Ignition Signal To ECM When "NE" Signal Is Input 4 Times With Engine Speed Of 600-4000 RPM

No "IG" Or "IGF" Ignition Signal To ECM From Ignitor Several Times In Succession

Fault In Transmission/Transaxle ECU Or ECM

Defective O2 Sensor, Open Or Short Ckt In O2 Sensor Signal

Open Or Short Ckt In Engine Coolant Temperature Sensor Signal

Open Or Short Ckt In Intake Air Temp. Sensor Signal

Lean Signal Sent By O2 Sensor For Several Seconds

Rich Signal Sent By O2 Sensor For Several Seconds

Open Or Short Ckt In Sub-O2 Sensor Signal

Defective O2 Sensor, Open Or Short Ckt In O2 Sensor Signal

Open Or Short Ckt In Airflow Meter Or MAP Sensor Signal

Open Or Short Ckt Between Airflow Meter Terminals

Turbocharger Pressure Is Abnormal

Open Or Short Ckt In Turbocharging Pressure Sensor, MAP Sensor Or BARO Sensor

Open Or Short Ckt In Throttle Position Sensor Signal

No Signal From Vehicle Speed Sensor For Several Seconds

No "STA" Signal To ECM Until Engine Reaches 800 RPM With Engine Cranking

Open Or Short Ckt In Sub-Throttle Position Sensor Signal

⁽²⁾ Problem In One Of 3 Ckts Monitored By ECM

Open Or Short Ckt In Knock Sensor Signal

Knock Control In ECM Is Faulty

Open Or Short Ckt In Knock Sensor Signal

EGR Gas Temperature Less Than Predetermined Level During EGR Control

Open Or Short Ckt In Fuel Pump Control Ckt Or Fuel Pump Electronic Control Unit (ECU)

Open In ECT1 Ckt Between ECM & Transmission Control Module (TCM) For At Least 2 Seconds

Open In ESA1 Ckt Between ECM & Transmission Control Module (TCM) For 1/2 Second After Engine Idles At Least 1/2 Second

Open In ESA2 Ckt Between ECM & Transmission Control Module (TCM) For 1/2 Second After Engine Idles At Least 1/2 Second

Open In ESA3 Ckt Between ECM & Transmission Control Module (TCM) For 1/2 Second After Engine Idles At Least 1/2 Second

⁽¹⁾	Listed are possible areas causing trouble codes. Not all trouble codes are used on all models.

⁽²⁾	Throttle position sensor, Park/Neutral switch and A/C Signal circuits are monitored.