P3190

1NZ-FXE ENGINE CONTROL SYSTEM: SFI SYSTEM: P3190: Poor Engine Power

DTC P3190 - Poor Engine Power

DTC P3191 - Engine does not Start

DTC P3193 - Fuel Run Out

DESCRIPTION

From the HV ECU, the ECM receives data such as power output required for the engine (required output), estimated torque produced by the engine (estimated torque), engine RPM of control target (target RPM), whether the engine is in start mode or not. Then, based on the required output and target RPM, the ECM calculates a target torque that is to be produced by the engine and compares it with the estimated torque. If the estimated torque is very low compared with the target torque, or the engine start mode continues for the specific duration calculated by water temperature, an abnormal condition is detected.

MONITOR DESCRIPTION

The ECM and HV control ECU are connected by a communication line called CAN. The ECM sends information on the engine speed and other data to the HV control ECU while the HV control ECU sends the information such as a requirement for the engine power to the ECM using the CAN communication line.
When the communication between the ECM and HV control ECU is normal and the following items becomes specific condition, the ECM will illuminate the MIL and set a DTC.
(a) Engine speed
(b) Power switch
(c) Target torque
(d) Ratio of target torque against estimated torque
(e) Fuel level

MONITOR STRATEGY

TYPICAL ENABLING CONDITIONS

TYPICAL MALFUNCTION THRESHOLDS

Case1: P3190

Case2: P3191

Case3: P3193

INSPECTION PROCEDURE
HINT: Read freeze frame data using Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air/fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.

PROCEDURE

1. CHECK OTHER DTC OUTPUT (IN ADDITION TO DTC P3190, P3191 AND/OR P3193)
(a) Connect Techstream to the DLC3.
(b) Turn the power switch ON (IG).
(c) Turn Techstream ON.
(d) Enter the following menus: Powertrain / Engine and ECT / Trouble Code.
(e) Read the DTCs.
Result:

HINT: If any other codes besides P3190, P3191 and/or P3193 are output, perform troubleshooting for those DTCs first.

B -- GO TO DTC CHART
A -- Continue to next step.

2. CHECK SHORTAGE OF FUEL
NG -- REFILL FUEL
OK -- Continue to next step.

3. CHECK AIR INDUCTION SYSTEM
OK:
The air induction system has no leakage and blockages.
NG -- REPAIR OR REPLACE AIR INDUCTION SYSTEM
OK -- Continue to next step.

4. CHECK FOR UNUSUAL NOISE OR VIBRATION WHEN STARTING ENGINE OR REVVING UP
OK:
Unusual noise and vibration do not occur.
NG -- REPAIR OR REPLACE
OK -- Continue to next step.

5. CHECK FUEL PRESSURE
OK:
Fuel pressure: 304 to 343 kPa (3.1 to 3.5 kgf/cm2, 44 to 50 psi)
NG -- CHECK AND REPAIR FUEL SYSTEM
OK -- Continue to next step.

6. INSPECT MASS AIR FLOW METER

(a) Remove the mass air flow meter.
(b) Inspect output voltage.
(1) Apply battery voltage across terminals +B and E2G.
(2) Connect the positive (+) tester probe to terminal VG, and negative (-) tester probe to terminal E2G.
(3) Blow air into the mass air flow meter, and check that the voltage fluctuates.
Standard voltage:

(c) Inspect resistance.
(1) Measure the resistance between the terminals of the mass air flow meter.
Standard resistance:

(d) Reinstall the mass air flow meter.
NG -- REPLACE MASS AIR FLOW METER
OK -- Continue to next step.

7. INSPECT ENGINE COOLANT TEMPERATURE SENSOR

(a) Remove the engine coolant temperature sensor.
(b) Measure the resistance between the terminals of the engine coolant temperature sensor.
Standard resistance:

NOTE: When checking the engine coolant temperature sensor in water, be careful not to allow water to contact the terminals. After checking, dry the sensor.
HINT: Alternative procedure: Connect an ohmmeter to the installed engine coolant temperature sensor and read the resistance. Use an infrared thermometer to measure the engine temperature in the immediate vicinity of the sensor. Compare these values to the resistance/temperature graph. Change the engine temperature (warm up or allow to cool down) and repeat the test.
(c) Reinstall the engine coolant temperature sensor.
NG -- REPLACE ENGINE COOLANT TEMPERATURE SENSOR
OK -- Continue to next step.

8. INSPECT CRANKSHAFT POSITION SENSOR

(a) Disconnect the C7 crankshaft position sensor connector.
(b) Measure the resistance between the terminals of the crankshaft position sensor connector.
Standard resistance:

(c) Reconnect the crankshaft position sensor connector.
NOTE: Terms "cold" and "hot" refer to the temperature of the sensor. "Cold" means approximately -10 to 50°C (14 to 122°F). "Hot" means approximately 50 to 100°C (122 to 212°F).

NG -- REPLACE CRANKSHAFT POSITION SENSOR
OK -- Continue to next step.

9. INSPECT CAMSHAFT POSITION SENSOR

(a) Disconnect the C1 camshaft position sensor connector.
(b) Measure the resistance between the terminals of camshaft position sensor connector.
Standard resistance:

(c) Reconnect the camshaft position sensor connector.
NOTE: Terms "cold" and "hot" refer to the temperature of the sensor. "Cold" means approximately -10 to 50°C (14 to 122°F). "Hot" means approximately 50 to 100°C (122 to 212°F).

NG -- REPLACE CAMSHAFT POSITION SENSOR
OK -- Continue to next step.

10. INSPECT THROTTLE CONTROL MOTOR

(a) Disconnect the throttle control motor connector.
(b) Using an ohmmeter, measure the motor resistance between terminals 1 (M-) and 2 (M+).
Standard resistance:

(c) Reconnect the throttle control motor connector.
NG -- REPLACE THROTTLE CONTROL MOTOR
OK -- Continue to next step.

11. INSPECT THROTTLE POSITION SENSOR

(a) Disconnect the throttle position sensor connector.
(b) Measure the resistance between the terminals of the throttle position sensor.
Standard resistance: