2001 TOYOTA SEQUOIA check engine

DI±296
± DIAGNOSTICSENGINE
490 Author: Date:
2005 SEQUOIA (RM1146U)
DTC P0604 Internal Control Module Random Access
Memory (RAM) Error
DTC P0606 ECM/PCM Processor
DTC P0607 Control Module Performance
DTC P0657 Actuator Supply Voltage Circuit / Open
MONITOR DESCRIPTION
The ECM continuously monitors its internal memory status, internal circuits, and output signals to the throttle
actuator. This self±check insures that the ECM is functioning properly. If any malfunction is detected, the
ECM will set the appropriate DTC and illuminate the MIL.
The ECM memory status is diagnosed by internal ºmirroringº of the main CPU and the sub CPU to detect
RAM (Random Access Memory) errors. The two CPUs also perform continuous mutual monitoring.
The ECM sets a DTC if: 1) outputs from the 2 CPUs are different and deviate from the standards, 2) the sig-
nals to the throttle actuator deviate from the standards, 3) a malfunction is found in the throttle actuator sup-
ply voltage, and 4) any other ECM malfunction is found.
DTC No.DTC Detecting ConditionTrouble Area
P0604
P0606
P0607
P0657
ECM malfunction
ECM
MONITOR STRATEGY
P0604Random access memory (RAM) error
RltdDTCP0606CPU malfunctionRelated DTCsP0607ECM range check
P0657ETCS power supply
Required sensors/componentsECM
Frequency of operationContinuous
DurationWithin 1 sec.
MIL operationImmediate
Sequence of operationNone
TYPICAL ENABLING CONDITIONS
The monitor will run whenever these
DTCs are not presentSee page DI±18
The typical enabling condition is not avail-
able±
DI3IK±13

± DIAGNOSTICSENGINE
DI±297
491 Author: Date:
2005 SEQUOIA (RM1146U)
TYPICAL MALFUNCTION THRESHOLDS
Detection CriteriaThreshold
P0604:
RAMRAM check failure
P0606:
Either of the following conditions is metCondition 1 or 2
1. Difference between TP of main CPU and TP of sub CPU0.3 V or more
2. Difference between APP of main CPU and APP of sub
CPU0.3 V or more
P0607:
Either of the following conditions is metCondition 1 or 2
1. All of the following conditions are metCondition (a), (b) and (c)
(a) CPU reset1 time or more
(b) Difference between TP and APP learned0.4 V or more
(c) Electronic throttle actuatorOFF
2. CPU reset2 times or more
P0657:
ECTS power supply when ignition switch OFF to ON7 V or more
INSPECTION PROCEDURE
HINT:
Read freeze frame data using the hand-held tester. 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, as well as other
data from the time when a malfunction occurred.
Replace ECM (See page SF±80).

DI±300
± DIAGNOSTICSENGINE
494 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
HINT:
Read freeze frame data using the hand±held tester. 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, as well as other
data from the time when a malfunction occurred.
1 Connect hand±held tester, and check STA signal.
PREPARATION:
(a) Connect the hand±held tester to the DLC3.
(b) Turn the ignition switch ON, and push the hand±held tester main switch ON.
(c) When using hand±held tester, enter the following menu: DIAGNOSIS / ENHANCED OBD II / DATA
LIST / ALL / STARTER SIG.
CHECK:
Read the STA signal on the hand±held tester while the starter operates.
OK:
Standard:
Ignition Switch PositionONSTART
STARTER SIGOFFON
OK Go to step 5.
NG
2 Check park/neutral position switch (See page DI±576).
NG Replace park/neutral position switch.
Go to next step 5 after the replacement.
OK
3 Check ignition switch (See page BE±24).
NG Replace ignition switch.
Go the next step 5 after the replacement.
OK

± DIAGNOSTICSENGINE
DI±301
495 Author: Date:
2005 SEQUOIA (RM1146U)
4 Connect hand±held tester, and check STA signal.
PREPARATION:
(a) Connect the hand±held tester to the DLC3.
(b) Turn the ignition switch ON, and push the hand±held tester main switch ON.
(c) On the hand±held tester, enter the following menu: DIAGNOSIS / ENHANCED OBD II / DATA LIST
/ ALL / STARTER SIG.
CHECK:
Read the STA signal on the hand±held tester while the starter operates.
OK:
Standard:
Ignition Switch PositionONSTART
STARTER SIGOFFON
NG Repair or replace harness or connector.
OK
5 Check DTC reoccur
PREPARATION:
(a) Connect the hand±held tester.
(b) Turn the ignition switch ON and hand±held tester main switch ON.
(c) Clear DTC (See page DI±43).
(d) Drive the vehicle more than 40 km/h (25 mph) for 20 seconds or more.
CHECK:
Check DTC reoccur.
RESULT:
Display (DTC Output)Proceed to
P0617A
No DTC outputB
A Replace ECM (See page SF±80).
B
Check for intermittent problems
(See page DI±11).

± DIAGNOSTICSENGINE
DI±303
497 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
1 Read current DTC.
NOTICE:
If P0630 is present, the VIN must be input to the ECM using the hand±held tester. However, all DTCs
are cleared automatically by the tester when inputting the VIN. If DTCs other than P0630 are present,
check them first.
NEXT
2 Input VIN with hand±held tester (See page DI±14).
NEXT
END

DI±304
± DIAGNOSTICSENGINE
498 Author: Date:
2005 SEQUOIA (RM1146U)
DTC P1340, P1341 Camshaft Position Sensor ºAº (Bank
Sensor 1)
CIRCUIT DESCRIPTION
Camshaft position sensor (G signal) consists of a magnet, iron core and pickup coil.
The camshaft drive gear (LH) has 3 teeth on its inner circumference. When the camshaft gear rotates, air
gap changes between the protrusion on the gear and the pickup coil. The change affects the magnetic field
and result in change in the resistance of the MRE element.
The crankshaft signal plate has 32 teeth and is mounted on the crankshaft. The crankshaft position sensor
generates 32 signals at every engine revolution. The ECM detects the standard crankshaft angle based on
the G signal and the actual crankshaft angle and the engine speed by the NE signal.
DTC No.DTC Detecting ConditionTrouble Area
P1340
No camshaft position sensor signal to ECM during cranking
(2 trip detection logic)
Open or short in camshaft position sensor circuit

Camshaft position sensor
P1340
P1341No camshaft position sensor signal to ECM with engine speed
600 rpm or more

Camshaft osition sensor

LH camshaft timing pulley

ECM
MONITOR DESCRIPTION
The camshaft position sensor (G signal) consists of a magnet and MRE element.
The camshaft drive gear has 5 teeth on its inner circumference. When the camshaft gear rotates, air gap
changes between the protrusion on the gear and the pickup coil. The change affects the magnetic field and
result in change in the resistance of the MRE element. The crankshaft angle sensor plate has 32 teeth and
output 32 signals every engine revolution. The ECM detects the standard crankshaft angle based on the
G signal and actual crankshaft angle and engine speed by NE signal.
MONITOR STRATEGY
RltdDTC
P1340Camshaft position sensor (Bank 1) range check
or rationality
Related DTCs
P1341Camshaft position sensor (Bank 1) range check
or rationality
Rid / tMain sensors/componentsCamshaft position sensorRequired sensors/componentsRelated sensors/componentsCrankshaft position sensor, Engine speed sensor
Frequency of operationContinuous
Duration5 sec.
MIL operationP1340 case 1 (no signal): 2 driving cycles
P1340 case 2 (mis±aligned), P1341: Immediate
Sequence of operationNone
TYPICAL ENABLING CONDITIONS
ItSpecificationItemMinimumMaximum
The monitor will run whenever these
DTCs are not presentSee page DI±18
P1340 Case 1 (No signal):
StarterON
Minimum battery voltage while starter ON±11 V
DID8F±01

B17445
Wire Harness Side:
Camshaft Position Sensor
A23559
2 V / DIV
GND
Crank Angle
120°120° 180°
180°
60°60°
200 ms /DIV
B17414
E6ECM Connector
G2+
G2±
DI±306
± DIAGNOSTICSENGINE
500 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
HINT:
Read freeze frame data using hand±held tester. Because freeze frame records the engine conditions when
the malfunction is detected. When troubleshooting, it is useful for determining whether the vehicle was run-
ning or stopped, the engine was warmed up or not, the air±fuel ratio was lean or rich, etc. at the time of the
malfunction.
1 Check voltage of camshaft position sensor power source circuit.
PREPARATION:
(a) Disconnect the Camshaft position sensor connector.
(b) Turn the ignition switch to ON.
CHECK:
Measure the voltage between terminal 3 of the camshaft posi-
tion sensor connector and body ground.
OK:
Standard: 4.5 to 5.5 V
NG Repair or replace harness or connector.
OK
2 Check camshaft position sensor signal.
PREPARATION:
Start the engine.
CHECK:
Check the waveform between the G2+ (E6±19) and G2±
(E6±29) of the ECM connector.
OK:
Standard: Correct waveform is as shown.
OK Replace ECM (See page IN±35).
NG

B17414
E6ECM Connector
G2+
G2±
B17445
Wire Harness Side:
Camshaft Position Sensor C1
BR3795OK NGClearance
± DIAGNOSTICSENGINE
DI±307
501 Author: Date:
2005 SEQUOIA (RM1146U)
3 Check for open and short in harness and connector between ECM and camshaft
position sensor.
PREPARATION:
(a) Disconnect the Camshaft position sensor connector.
(b) Disconnect the E6 ECM connector.
CHECK:
Measure the resistance between wire harness side connectors.
OK:
Standard:
Tester ConnectionSpecified Condition
Camshaft position sensor (C1±2) ±
G2+ (E6±19)Below 1 W
Camshaft position sensor (C1±1) ±
G2± (E6±29)Below 1 W
Camshaft position sensor (C1±2) or
G2+ (E6±19) ± Body ground10 kW or higher
Camshaft position sensor (C1±1) or
G2± (E6±29) ± Body ground10 kW or higher
NG Repair or replace harness or connector.
OK
4 Inspect sensor installation and signal plate tooth of LH camshaft timing pulley.
CHECK:
Check the camshaft position sensor installation.
OK:
The camshaft position sensor is installed properly.
NG Tighten sensor installation bolt.
OK