2001 TOYOTA HIGHLANDER Service Repair Manual

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Page 1913 of 2572

TOYOTA HIGHLANDER 2001 Service Repair Manual - DIAGNOSTICSSFI SYSTEM (2AZ-FE)
05-279
469 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
6 CHECK AIR INDUCTION SYSTEM
(a) Check for vacuum leaks in the air induction system.
OK: No leak i

Page 1914 of 2572

TOYOTA HIGHLANDER 2001 Service Repair Manual 05-280
- DIAGNOSTICSSFI SYSTEM (2AZ-FE)
470 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
11 READ OUTPUT DTC
(a) Read the DTC using the hand-held tester or the OBD II scan tool.
Result:
Di

Page 1915 of 2572

TOYOTA HIGHLANDER 2001 Service Repair Manual - DIAGNOSTICSSFI SYSTEM (2AZ-FE)
05-281
471 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
17 READ OUTPUT DTC (A/F SENSOR DTC OUTPUT AGAIN)
(a) Read the DTC using the hand-held tester or th

Page 1916 of 2572

TOYOTA HIGHLANDER 2001 Service Repair Manual 05-282
- DIAGNOSTICSSFI SYSTEM (2AZ-FE)
472 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
DTC P2238 OXYGEN SENSOR PUMPING CURRENT
CIRCUIT LOW (FOR A/F SENSOR)(BANK 1
SENSOR 1)
DTC P2239 OX

Page 1917 of 2572

TOYOTA HIGHLANDER 2001 Service Repair Manual - DIAGNOSTICSSFI SYSTEM (2AZ-FE)
05-283
473 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
MONITOR DESCRIPTION
The air-fuel ratio (A/F) sensor varies its voltage output in proportion to the

Page 1918 of 2572

TOYOTA HIGHLANDER 2001 Service Repair Manual 05-284
- DIAGNOSTICSSFI SYSTEM (2AZ-FE)
474 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
TYPICAL MALFUNCTION THRESHOLDS
P2238 (Open circuit between AF+ and AF-):
A/F sensor admittanceBel

Page 1919 of 2572

TOYOTA HIGHLANDER 2001 Service Repair Manual +25 %
-12.5 %
More than 3.35 V
Less than 3.0 V
Case 1
Case 2
Case 3
Case 4
Output voltage of A/F sensor
(sensor 1)
Injection volume
Output voltage
Output voltage of heated oxygen
sensor (sensor 2)Ma

+25 %
-12.5 %
More than 3.35 V
Less than 3.0 V
Case 1
Case 2
Case 3
Case 4
Output voltage of A/F sensor
(sensor 1)
Injection volume
Output voltage
Output voltage of heated oxygen
sensor (sensor 2)Main suspect
trouble area
OK
+25 %
-12.5 %
More than 3.35 V
Less than 3.0V
Injection volume
Output voltage
+25 %
-12.5 %
More than 0.55 V
Less than 0.4V
Injection volume
Output voltage
A/F sensor
(A/F sensor, heater, A/F sen-
sor circuit)
+25 %
-12.5 %
More than 0.55 V
Less than 0.4V
Injection volume
Output voltage
+25 %
-12.5 %
Injection volume
Output voltage
NG
+25 %
-12.5 %
Injection volume
Output voltage
NG
+25 %
-12.5 %
Injection volume
Output voltage
NG
+25 %
-12.5 %
Injection volume
Output voltage
NGExtremely rich or lean actual
air-fuel ratio
(Injector, fuel pressure, gas
leakage in exhaust system,
etc.) OK
OK
OK
Almost
No reaction
Almost
No reaction
Almost
No reaction Almost
No reaction
'
Heated oxygen sensor
(heated oxygen sensor,
heater, heated oxygen sensor
circuit)
- DIAGNOSTICSSFI SYSTEM (2AZ-FE)
05-285
475 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
NOTICE:
The A/F sensor output has a few seconds of delay and the heated oxygen sensor output has about
20 seconds of delay at maximum.
The following A/F CONTROL procedure enables a technician to check and graph the voltage outputs of both
the A/F sensor and the heated oxygen sensor.
For displaying the graph, enter ºACTIVE TEST / A/F CONTROL / USER DATAº, select ºAFS B1S1 and O2S
B1S2º by pressing ºYESº and push ºENTERº. Then press ºF4º.
HINT:
If DTC P2237, P2238, P2239, P2251, P2252 or P2253 is displayed, check the bank 1 sensor 1 circuit.
Read freeze frame data using the hand-held tester or the OBD II scan tool. Freeze frame data records
the engine conditions when a malfunction is detected. When troubleshooting, freeze frame data can
help determine if the vehicle was running or stopped, if the engine was warmed up or not, if the air-fuel
ratio was lean or rich, and other data from the time the malfunction occurred.

Page 1920 of 2572

TOYOTA HIGHLANDER 2001 Service Repair Manual A52607
AF-AF+
A6
A/F sensor
B60778
5
12 312
5
3
05-286
- DIAGNOSTICSSFI SYSTEM (2AZ-FE)
476 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
1 INSPECT AIR FUEL RATIO SENSOR (HEATER RESISTANCE

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