Toyota FJ Cruiser (GSJ 10, 15 series). Manual — part 33
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1GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
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ES
(a) Check the harness and the connector between the ECM
and the A/F sensor.
(1) Disconnect the B33*1 or B31*2 A/F sensor
connector.
HINT:
•
*1: Bank 1 Sensor 1
•
*2: Bank 2 Sensor 1
(2) Disconnect the B2 ECM connector.
(3) Check the resistance.
Standard Resistance (Check for open)
Standard Resistance (Check for short)
(4) Reconnect the A/F sensor connector.
(5) Reconnect the ECM connector.
(b) Check the harness and the connector between the A/F
sensor and A/F sensor heater relay.
(1) Disconnect the B33*1 or B31*2 A/F sensor
connector.
(2) Remove the A/F sensor heater relay from the
engine room relay block.
(3) Check the resistance.
Standard Resistance (Check for open)
Standard Resistance (Check for short)
(4) Reconnect the A/F sensor connector.
(5) Reinstall the A/F sensor heater relay.
NG
OK
4
CHECK HARNESS AND CONNECTOR (A/F SENSOR - ECM, A/F SENSOR - A/F SENSOR
HEATER RELAY)
B31
Wire Harness Side:
A/F Sensor
Connector
B33 *1
*2
Front View
+B
HA1A *1
HA2A *2
*1: Bank 1
*2: Bank 2
B2
ECM Connector
HA2A
HA1A
A116153E09
Tester Connections
Specified Conditions
HA1A (B33-1) - HA1A (B2-2)
Below 1
Ω
HA2A (B31-1) - HA2A (B2-1)
Tester Connections
Specified Conditions
HA1A (B33-1) or HA1A (B2-2) - Body ground
10 k
Ω or higher
HA2A (B31-1) or HA2A (B2-1) - Body ground
1
2
5
3
A/F Sensor Heater Relay
Engine Room Relay Block
A133433E01
Tester Connections
Specified Conditions
+B (B33-2) - A/F sensor heater relay (3)
Below 1
Ω
+B (B31-2) - A/F sensor heater relay (3)
Tester Connections
Specified Conditions
+B (B33-2) or A/F sensor heater relay (3) - Body
ground
10 k
Ω or higher
+B (B31-2) or A/F sensor heater relay (3) - Body
ground
REPAIR OR REPLACE HARNESS OR
CONNECTOR
REPLACE ECM (See page
)
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ES–88
1GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
ES
HINT:
Sensor 2 refers to the sensor mounted behind the Three-Way Catalytic Converter (TWC) and located far
from the engine assembly.
DESCRIPTION
Refer to DTC P0136 (See page
).
HINT:
•
When any of these DTCs are set, the ECM enters fail-safe mode. The ECM turns off the Heated
Oxygen (HO2) Sensor heater in fail-safe mode. Fail-safe mode continues until the engine switch is
turned off.
DTC
P0037
Oxygen Sensor Heater Control Circuit Low
(Bank 1 Sensor 2)
DTC
P0038
Oxygen Sensor Heater Control Circuit High
(Bank 1 Sensor 2)
DTC
P0057
Oxygen Sensor Heater Control Circuit Low
(Bank 2 Sensor 2)
DTC
P0058
Oxygen Sensor Heater Control Circuit High
(Bank 2 Sensor 2)
DTC
P0141
Oxygen Sensor Heater Circuit Malfunction
(Bank 1 Sensor 2)
DTC
P0161
Oxygen Sensor Heater Circuit Malfunction
(Bank 2 Sensor 2)
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1GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
ES–89
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•
The ECM provides a pulse width modulated control circuit to adjust the current through the heater. The
HO2 sensor heater circuit uses a relay on the +B side of the circuit.
HINT:
•
Bank 1 refers to the bank that includes cylinder No. 1.
•
Bank 2 refers to the bank that does not include cylinder No. 1.
•
Sensor 1 refers to the sensor closest to the engine assembly.
•
Sensor 2 refers to the sensor farthest away from the engine assembly.
MONITOR DESCRIPTION
The sensing position of the Heated Oxygen (HO2) sensor has a zirconia element which is used to detect
the oxygen concentration in the exhaust gas. If the zirconia element is at the appropriate temperature,
and the difference between the oxygen concentrations surrounding the inside and outside surfaces of the
sensor is large, the zirconia element generates voltage signals. In order to increase the oxygen
concentration detecting capacity of the zirconia element, the ECM supplements the heat from the exhaust
with heat from a heating element inside the sensor.
Heated oxygen sensor heater range check (P0037, P0038, P0057 and P0058):
The ECM monitors the current applied to the O2 sensor heater to check the heater for malfunctions. If the
current is below the threshold value, the ECM will determine that there is an open circuit in the heater. If
the current is above the threshold value, the ECM will determine that there is a short circuit in the heater.
Example:
DTC No.
DTC Detection Conditions
Trouble Areas
P0037
P0057
Heated Oxygen (HO2) sensor heater current less than 0.3 A
(1 trip detection logic)
•
Open in HO2 sensor heater circuit
•
HO2 sensor heater
•
EFI relay
•
ECM
P0038
P0058
Heated Oxygen (HO2) sensor heater current more than 2 A
(1 trip detection logic)
•
Short in HO2 sensor heater circuit
•
HO2 sensor heater
•
EFI relay
•
ECM
P0141
P0161
Cumulative heater resistance correction value exceeds the
acceptable threshold. (2 trip detection logic)
•
Open or short in HO2 sensor heater circuit
•
HO2 sensor heater
•
EFI relay
•
ECM
Reference (System Diagram of Bank 1 Sensor 2):
From
Battery
EFI
EFI
Ground
Heater
Sensor
HO2 Sensor
EFI NO. 2
OX1B
E2
MREL
HT1B
OX1B
HT1B
E2
+B
ECM
Duty
Control
A103832E33
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1GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
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The ECM sets DTC P0038 or P0058 when the current in the HO2 sensor heater is more than 2 A.
Conversely, when the heater current is less than 0.3 A, DTC P0037 or P0057 is set.
Heated oxygen sensor heater performance (P0141 and P0161):
After the accumulated heater ON time exceeds 100 seconds, the ECM calculates the heater resistance
using the battery voltage and the current applied to the heater. If the resistance is above the threshold
value, the ECM will determine that there is a malfunction in the HO2S heater and set DTC P0141 and
P0161.
MONITOR STRATEGY
TYPICAL ENABLING CONDITIONS
All:
P0037 and P0057:
P0038 and P0058 (Case 1):
P0038 and P0058 (Case 2):
P0141 and P0161:
Related DTCs
P0037: Heated oxygen sensor heater (bank 1 sensor 2) open/short
(Low electrical current)
P0038: Heated oxygen sensor heater (bank 1 sensor 2) open/short
(High electrical current)
P0057: Heated oxygen sensor heater (bank 2 sensor 2) open/short
(Low electrical current)
P0058: Heated oxygen sensor heater (bank 2 sensor 2) open/short
(High electrical current)
P0141: Heated oxygen sensor heater performance (bank 1 sensor 2)
P0161: Heated oxygen sensor heater performance (bank 2 sensor 2)
Required sensors / components (Main)
Heated oxygen sensor heater (bank 1 sensor 2)
Heated oxygen sensor heater (bank 2 sensor 2)
Required sensors / components (Sub)
-
Frequency of operation
Continuous: P0037, P0038, P0057, P0058
Once per driving cycle: P0141, P0161
Duration
0.5 seconds: P0037, P0057
Within 1 second: P0038, P0058
10 seconds: P0141 and P0161
MIL operation
Immediate: P0037, P0038, P0057 and P0058
2 driving cycles: P0141 and P0161
Sequence of operation
None
Monitor runs whenever following DTCs are not present
None
Battery voltage
10.5 to 20 V
Battery voltage
10.5 V or more
Engine
Running
Starter
OFF
Battery voltage
10.5 to 20 V
One of the following conditions is met:
Condition A or B
A. All of the following conditions are met:
Condition 1, 2, 3, 4 and 5
1. Battery voltage
10.5 V or more
2. Fuel cut
OFF
3. Time after fuel cut ON to OFF
30 seconds or more
4. Accumulated heater ON time
100 seconds or more
5. Learned heater OFF current operation
Completed
B. Duration that rear heated oxygen sensor impedance is less than 15
k
Ω
2 seconds or more
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