CONDITIONING FOR SENSOR TESTING
Perform the operation with the engine speeds and time durations described below prior to checking the waveforms of the air fuel ratio and heated oxygen sensors. This is to activate the sensors sufficiently to obtain appropriate inspection results.
Scheme 167
Scheme 167: CONDITIONING FOR SENSOR TESTING
- (a) Connect the Techstream to the DLC3.
- (b) Start the engine and warm it up with all the accessories switched off until the engine coolant temperature stabilizes.
- (c) Run the engine at an engine speed of between 2500 rpm and 3000 rpm for at least 3 minutes.
- (d) While running the engine at 3000 rpm for 2 seconds, and then 2000 rpm for 2 seconds, check the waveforms of the air fuel ratio and heated oxygen sensors using the Techstream.
- If the voltage output of either the air fuel ratio or heated oxygen sensor does not fluctuate, or there is a noise in the waveform of either sensor, the sensor may be malfunctioning.
- If the voltage outputs of both the sensors remain lean or rich, the air fuel ratio may be extremely lean or rich. In such cases, perform the Control the Injection Volume for A/F Sensor Active Test using the Techstream.
- If the Three-way Catalytic Converter (TWC) has deteriorated, the heated oxygen sensor (located behind the Three-way Catalytic Converter [TWC]) voltage output fluctuates up and down frequently, even under normal driving conditions (active air fuel ratio control is not performed).
Scheme 168
DTC SUMMARY
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | MIL | Memory |
|---|
| P043E | Evaporative Emission System Leak Detection Reference Orifice Low Flow | Reference orifice clogged during key-off EVAP monitor | Canister pump module Connector/wire harness (Canister pump module - ECM) ECM | Comes on | DTC stored |
| P043F | Evaporative Emission System Reference Orifice High Flow | Reference orifice high-flow during key-off EVAP monitor | Canister pump module Connector/wire harness (Canister pump module - ECM) ECM | Comes on | DTC stored |
| P2401 | Evaporative Emission Leak Detection Pump Stuck OFF | Leak detection pump off malfunction during key-off EVAP monitor | Canister pump module Connector/wire harness (Canister pump module - ECM) ECM | Comes on | DTC stored |
| P2402 | Evaporative Emission Leak Detection Pump Stuck ON | Leak detection pump on malfunction during key-off EVAP monitor | Canister pump module Connector/wire harness (Canister pump module - ECM) ECM | Comes on | DTC stored |
| P2419 | Evaporative Emission System Switching Valve Control Circuit Low | Vent valve on (closed) malfunction during key-off EVAP monitor | Canister pump module Connector/wire harness (Canister pump module - ECM) ECM | Comes on | DTC stored |
| DTC No. | Monitoring Item | Detection Timing | Detection Logic |
|---|
| P043E | Reference orifice clogged | While engine switch off | 2 trip |
| P043F | Reference orifice high-flow |
| P2401 | Leak detection pump stuck off |
| P2402 | Leak detection pump stuck on |
| P2419 | Vent valve stuck closed |
The reference orifice is located inside the canister pump module.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | MIL | Memory |
|---|
| P0441 | Evaporative Emission Control System Incorrect Purge Flow | One of the following conditions met: Leak detection pump creates negative pressure (vacuum) in EVAP system and EVAP system pressure measured. Reference pressure is measured at start and at end of leak check. If stabilized pressure higher than [second reference pressure x 0.2], ECM determines that purge VSV stuck open. After EVAP leak check performed, purge VSV turned on (open), and atmospheric air introduced into EVAP system. Reference pressure is measured at start and at end of check. If pressure does not return to near atmospheric pressure, ECM determines that purge VSV stuck closed. While engine running, following conditions successively met: Negative pressure not created in EVAP system when purge VSV turned on (open) EVAP system pressure change less than 0.15 kPa(gauge) [1.125 mmHg(gauge)] when vent valve turned on (closed) Atmospheric pressure change before and after purge flow monitor less than 0.1 kPa(gauge) [0.75 mmHg(gauge)] | Purge VSV Purge line Connector/wire harness (Purge VSV - ECM) ECM Canister pump module Canister (filter inside canister clogged) Leak from EVAP system | Comes on | DTC stored |
| DTC No. | Monitoring Item | Detection Timing | Detection Logic |
|---|
| P0441 | Purge VSV (Vacuum Switching Valve) stuck open | While engine switch off | 2 trip |
| Purge VSV stuck closed | While engine switch off | 2 trip |
| Purge flow | While engine running | 2 trip |
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | MIL | Memory |
|---|
| P0451 | Evaporative Emission Control System Pressure Sensor Range / Performance | Either of the following conditions is met: Sensor output voltage fluctuates frequently in a certain time period. Sensor output voltage does not vary in a certain time period. | Canister pump module Connector/wire harness (Canister pump module - ECM) EVAP system hose (pipe from air inlet port to canister pump module, canister filter, fuel tank vent hose) ECM | Comes on | DTC stored |
| P0452 | Evaporative Emission Control System Pressure Sensor / Switch Low Input | EVAP pressure sensor less than 42.11 kPa(abs) [315.867 mmHg(abs)] for 0.5 seconds. | Canister pump module Connector/wire harness (Canister pump module - ECM) EVAP system hose (pipe from air inlet port to canister pump module, canister filter, fuel tank vent hose) ECM | Comes on | DTC stored |
| P0453 | Evaporative Emission Control System Pressure Sensor / Switch High Input | EVAP pressure sensor higher than 123.761 kPa(abs) [928.331 mmHg(abs)] for 0.5 seconds. | Canister pump module Connector/wire harness (Canister pump module - ECM) EVAP system hose (pipe from air inlet port to canister pump module, canister filter, fuel tank vent hose) ECM | Comes on | DTC stored |
| DTC No. | Monitoring Item | Detection Timing | Detection Logic |
|---|
| P0451 | Canister pressure sensor abnormal voltage fluctuation | EVAP monitoring (engine switch off) Engine running | 2 trip |
| Canister pressure sensor constant voltage | EVAP monitoring (engine switch off) | 2 trip |
| P0452 | Canister pressure sensor low input | Engine switch on (IG) EVAP monitoring (engine switch off) | 1 trip |
| P0453 | Canister pressure sensor high input | Engine switch on (IG) EVAP monitoring (engine switch off) | 1 trip |
The canister pressure sensor is built into the canister pump module.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | MIL | Memory |
|---|
| P0455 | Evaporative Emission Control System Leak Detected (Gross Leak) | Leak detection pump creates negative pressure (vacuum) in EVAP system and EVAP system pressure is measured. Reference pressure is measured at start and end of leak check. If stabilized pressure is higher than [second reference pressure x 0.2], ECM determines that EVAP system has a large leak. | Fuel cap (loose) Leakage from EVAP line (canister - fuel tank) Leakage from EVAP line (purge VSV - canister) Leakage from canister pump module Leakage from fuel tank Leakage from canister | Comes on | DTC stored |
| P0456 | Evaporative Emission Control System Leak Detected (Very Small Leak) | Leak detection pump creates negative pressure (vacuum) in EVAP system and EVAP system pressure is measured. Reference pressure measured at start and end of leak check. If stabilized pressure is higher than second reference pressure, ECM determines that EVAP system has a small leak. | Fuel cap (loose) Leakage from EVAP line (canister - fuel tank) Leakage from EVAP line (purge VSV - canister) Leakage from canister pump module Leakage from fuel tank Leakage from canister | Comes on | DTC stored |
| DTC No. | Monitoring Item | Detection Timing | Detection Logic |
|---|
| P0455 | EVAP gross leak | While engine switch off | 2 trip |
| P0456 | EVAP small leak | While engine switch off | 2 trip |
