Lexus Car ES, IS, LS 1998-06

5.2L V8 VIN Y Auto 3

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Trouble Code: P0713



A/T Transmission Fluid Temperature Sensor High Input

Possible Causes:



TFT Sensor signal circuit is open between the Sensor and PCM
 
TFT Sensor ground circuit is open between Sensor and PCM
 
TFT Sensor is damaged or has failed (it may be open internally)
 
PCM has failed
 

Trouble Code: P0715



A/T Input Speed Sensor Circuit Malfunction

Possible Causes:



ISS signal (+) circuit is open, shorted to ground or to power
 
ISS signal (-) circuit is open, shorted to ground or to power
 
ISS is damaged or has failed (it may be open internally)
 
Overdrive clutch drum lugs are damaged or missing
 
PCM has failed
 

Trouble Code: P0720



A/T Output Speed Sensor - Low Output Above 15 MPH

Possible Causes:



OSS signal (+) circuit is open, shorted to ground or to power
 
OSS signal (-) circuit is open, shorted to ground or to power
 
OSS is damaged or has failed (it may be open internally)
 
Parking pawl lugs damaged or missing
 
PCM has failed
 

Trouble Code: P0740



A/T Torque Converter Clutch - No RPM Drop At Lockup

Possible Causes:



Internal transmission component fault (Input or Reaction shaft)
 
Internal transmission leakage (valve body leaking or seal rings)
 
Converter clutch valve or clutch timing valve is sticking
 
TCC assembly has failed
 

Trouble Code: P0743



A/T Torque Converter Clutch Solenoid Circuit Failure

Possible Causes:



TCC power circuit is open between the solenoid and Fused B+
 
TCC solenoid control circuit is open or shorted to ground
 
TCC solenoid control circuit is shorted to system power
 
TCC solenoid is damaged or has failed
 
PCM has failed
 

Trouble Code: P0748



A/T Governor Pressure Solenoid/Transmission Relay Fault

Possible Causes:



A/T transmission relay power circuit is open (test power to B+)
 
A/T transmission relay is damaged or has failed
 
Governor pressure solenoid circuit is open or shorted to ground
 
Governor pressure solenoid is damaged or has failed
 
PCM has failed
 

Trouble Code: P0750



A/T Low/Reverse Solenoid Circuit Failure

Possible Causes:



L/R solenoid control circuit is open or shorted to ground
 
L/R solenoid control circuit is shorted to system power
 
L/R Solenoid is damaged or has failed
 
TCM or PCM has failed
 

Trouble Code: P0751



A/T Overdrive Switch Pressed Low For Over 5 Minutes

Possible Causes:



Overdrive Switch Off" circuit is shorted to ground
 
Overdrive Switch is damaged or has failed
 
PCM has failed
 

Trouble Code: P0753



A/T 3-4 Solenoid/Transmission Relay Circuit Failure

Possible Causes:



3-4 Solenoid control circuit is open or shorted to ground
 
3-4 Solenoid is damaged or has failed
 
Transmission relay power circuit is open (check the fused B+)
 
Transmission relay is damaged or has failed
 
PCM has failed
 

Trouble Code: P0755



A/T 2/4 Solenoid Circuit Failure

Possible Causes:



2/4 Solenoid control circuit is open or shorted to ground
 
2/4 Solenoid control circuit is shorted to system power
 
2/4 Solenoid is damaged or has failed
 
TCM or PCM has failed
 

Trouble Code: P0783



A/T 3-4 Shift Solenoid - No RPM Drop At Lockup

Possible Causes:



ATF fluid level is burnt, contaminated or low
 
3-4 Solenoid control circuit is open or shorted (intermittent fault)
 
3-4 Solenoid is damaged or has failed
 
Transmission oil pan has excessive debris
 

Trouble Code: P1195



O2 (B1 S1) Circuit Insufficient Activity

Possible Causes:



Base engine mechanical fault affecting more than one cylinder
 
Exhaust leak present in exhaust manifold or exhaust pipes
 
O2 element fuel contamination or has deteriorated
 
O2 signal circuit or ground circuit has high resistance
 
PCM has failed
 

Trouble Code: P1196



O2 (B2 S1) Circuit Insufficient Activity

Possible Causes:



Base engine mechanical fault affecting more than one cylinder
 
Exhaust leak present in exhaust manifold or exhaust pipes
 
O2 element fuel contamination or has deteriorated
 
O2 signal circuit or ground circuit has high resistance
 

Trouble Code: P1197



O2 (B1 S2) Circuit Insufficient Activity

Possible Causes:



Base engine mechanical fault affecting more than one cylinder
 
Exhaust leak present in exhaust manifold or exhaust pipes
 
O2 element fuel contamination or has deteriorated
 
O2 signal circuit or ground circuit has high resistance
 

Trouble Code: P1281



Engine Is Cold Too Long

Possible Causes:



Check the operation of the thermostat (it may be stuck open)
 
ECT Sensor signal circuit has high resistance
 
ECT Sensor is damaged or it has failed
 
Inspect for low coolant level or an incorrect coolant mixture
 

Trouble Code: P1282



Fuel Pump Relay Control Circuit Malfunction

Possible Causes:



Fuel pump relay control circuit is open or shorted to ground
 
Fuel pump relay power circuit is open (test power from Ignition)
 
Fuel pump relay is damaged or has failed
 
PCM has failed
 

Trouble Code: P1289



Manifold Tuning Valve Control Circuit Malfunction

Possible Causes:



MTV control circuit is open between the solenoid and PCM
 
MTV control circuit is shorted to Sensor or chassis ground
 
MTV is damaged or has failed
 
PCM has failed
 

Trouble Code: P1294



Target Idle Speed Not Reached

Possible Causes:



Engine vacuum leak in a hose, brake booster or in the engine
 
IAC motor control circuits open or grounded in the wire harness
 
Throttle body dirty or restricted (trying cleaning it and retesting)
 
Throttle linkage or throttle plate not in the correct position
 
PCM has failed
 

Trouble Code: P1297



No Change In MAP Signal From Start To Run Transition

Possible Causes:



Engine vacuum port to MAP Sensor clogged, dirty or restricted
 
MAP Sensor signal is skewed or the Sensor is out-of-calibration
 
MAP Sensor VREF circuit open or grounded (intermittent fault)
 
PCM has failed
 

Trouble Code: P1299



Vacuum Leak Present With IAC Valve Fully Seated

Possible Causes:



Leaking engine vacuum hose, brake booster, or in the engine
 
MAP Sensor is out-of-calibration or skewed
 
TP Sensor is damaged or has failed (perform a sweep test)
 
PCM has failed
 

Trouble Code: P1388



Auto Shutdown Relay Control Circuit Malfunction

Possible Causes:



ASD relay control circuit is open between the relay and PCM
 
ASD relay control circuit is shorted to ground
 
ASD relay power circuit is open (test power from Fused B+)
 
ASD relay is damaged or has failed
 
PCM has failed
 

Trouble Code: P1389



No Auto Shutdown Relay Output Voltage To PCM

Possible Causes:



ASD relay connector is damaged, loose or shorted
 
ASD relay output circuit is open between the relay and PCM
 
ASD relay power circuit is open (test power from Fused B+)
 
ASD relay is damaged or has failed
 
PCM has failed
 

Trouble Code: P1390



Timing Belt Skipped One Tooth Or More

Possible Causes:



Camshaft timing is out of specifications
 
Valve timing is out of specifications
 

Trouble Code: P1391



CKP Or CMP Sensor Signal Intermittent

Possible Causes:



Camshaft Sensor is not installed properly
 
Engine valve timing is not within specifications
 
Perform a CKP and CMP Sensor relearn with the scan tool
 
Tone wheel or pulse ring is damaged
 

Trouble Code: P1398



Misfire Adaptive Numerator At Limit

Possible Causes:



Base engine problem (i.e., low cylinder compression)
 
CKP Sensor crankshaft target variation too large
 
CKP Sensor improperly installed or the CKP Sensor has failed
 
CKP Sensor signal circuit open or shorted (intermittent fault)
 
Tone wheel or pulse ring is damaged
 

Trouble Code: P1486



EVAP Leak Detection Monitor Pinched Hose Detected

Possible Causes:



EVAP vapor hose blocked between the fuel tank and the LDP (i.e., in the OLFV, rollover or vapor hose)
 
EVAP canister is clogged or full of dirt or moisture
 
EVAP ventilation solenoid is damaged or has failed
 
Purge line is loose, damaged or incorrectly routed
 
PCM has failed
 

Trouble Code: P1489



High Speed Radiator Fan Relay Circuit Malfunction

Possible Causes:



HFAN radiator relay control circuit is open or shorted to ground
 
HFAN radiator relay power circuit is open (test power to IGN)
 
HFAN radiator fan relay is damaged or has failed
 
PCM has failed
 

Trouble Code: P1490



Low Speed Radiator Fan Relay Circuit Malfunction

Possible Causes:



LFAN radiator relay control circuit is open or shorted to ground
 
LFAN radiator relay power circuit is open (test power to IGN)
 
LFAN radiator fan relay is damaged or has failed
 
PCM has failed
 

Trouble Code: P1491



Radiator Fan Control Relay Circuit Malfunction

Possible Causes:



Radiator fan control relay circuit is open or shorted to ground
 
Radiator fan control relay circuit is open (test power to IGN)
 
Radiator fan control relay is damaged or has failed
 
PCM has failed
 

Trouble Code: P1492



Battery Temperature Sensor Circuit High Input

Possible Causes:



BTS signal circuit is open between the Sensor and the PCM
 
BTS ground circuit is open between the Sensor and the PCM
 
BTS (Sensor) is damaged or the PCM has failed
 

Trouble Code: P1493



Battery Temperature Sensor Circuit Low Input

Possible Causes:



BTS circuit is shorted to ground between Sensor and the PCM
 
BTS (Sensor) is damaged or has failed
 
PCM has failed
 

Trouble Code: P1494



EVAP Leak Detection Pump Switch Or Mechanical Fault

Possible Causes:



LDP switch signal circuit is open or shorted to ground
 
LDP switch power circuit is open (test power to Fused Ignition)
 
LDP vacuum hose is clogged, loose or restricted
 
LDP assembly is damaged or has failed (the switch has failed)
 

Trouble Code: P1495



Leak Detection Pump Solenoid Circuit Malfunction

Possible Causes:



LDP power supply circuit from the ignition switch is open
 
LDP solenoid control circuit is open or shorted to ground
 
LDP assembly is damaged or it has failed
 
PCM has failed
 

Trouble Code: P1496



5-Volt VREF Supply Voltage Too Low

Possible Causes:



A/C pressure Sensor has failed (a short to ground condition)
 
MAP Sensor has failed (a short to ground condition)
 
TP Sensor has failed (a short to ground condition)
 
PCM has failed
 

Trouble Code: P1498



No CCD Messages Received From The TCM

Possible Causes:



CCD data Bus circuit is open, shorted to ground or to power
 
TCM or the PCM has failed
 

Trouble Code: P1499



Radiator (Hydraulic) Fan Solenoid Circuit Failure

Possible Causes:



Radiator fan solenoid control circuit is open
 
Radiator fan solenoid ground circuit is open
 
Radiator fan solenoid power circuit is open
 
Radiator fan solenoid is damaged or has failed
 
PCM has failed
 

Trouble Code: P1594



Charging System Voltage Too High

Possible Causes:



Battery temperature Sensor is damaged or has failed (skewed)
 
Generator field driver circuit is shorted to ground
 
Generator has an internal short circuit condition
 
PCM has failed
 

Trouble Code: P1595



Speed Control Solenoid Circuit Failure

Possible Causes:



S/C power supply circuit is open (test power from Brake switch)
 
S/C vacuum solenoid control circuit open or shorted to ground
 
S/C vent solenoid control circuit is open or shorted to ground
 
S/C vacuum or vent solenoid is damaged or has failed
 
PCM has failed
 

Trouble Code: P1596



Speed Control Switch Continuous High Input

Possible Causes:



S/C On/Off switch is open
 
S/C switch (MUX switch) is open
 
S/C switch (MUX switch) is shorted to VREF or system power
 
S/C switch (MUX switch) is damaged or has failed
 
PCM has failed
 

Trouble Code: P1597



Speed Control Switch Continuous Low Input

Possible Causes:



S/C On/Off switch is shorted to ground
 
S/C switch (MUX switch) is shorted to ground
 
S/C switch (MUX switch) is damaged or has failed
 
PCM has failed
 

 
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